I think my sister is narcissistic?

I won't go into to much detail, because the past isn't relavent, but just to quickly summarize our current drama there has been tension between us for months because she wanted to watch a video, I told her no, she got angry at me, then she's made it her life mission to make me is miserable as possible. She shit talked me to all of my friends, told my commissioner to block me, refused to let me get into contact with people who commissioned me (logged me out of my account that I communicate to my customers on, then refused to let me have it back because 'she needed it more'), stole my package because it was "basically hers" cause I owed her a few dollars, She deleted multiple of my projects, she's been logging into my accounts and watching my activity on all of them, and she has been lingering in my room to see if I put anything new into it (she said this herself), and on top of that her lovely gaslighting! She keeps bringing up past events, hating on my friends to justify her honestly torment at this point towards me (things that I did when I was 15, I am currently 19) and it is making me miserable.

I have not been interacting with her because of the way she's been treating me, she finds this frustrating and takes every opportunity that I walk by her to comment on my physical apperance, my personality and my "lack of friends". I chose not to respond. This week, I thought things may have gotten better so I tried to approach her asking a geniune question. It was about tomodachi life, simple conversation, just asking how the game is because she had early access to it, she told be she was unable to run it on her computer, I told her I ordered a physical copy. She immediately accused me of lying, then when I clarfied she started asking me to share it with her, I told her id think about it, this seemed to irritate her even more, she then asked about a previous drama (for short context: she added me into a groupchat with people I was unfaimilar with where they were actively sending explicit photos, they were all alot older then me and they were making some.. interesting.. jokes, I started responding to some of the messages telling them to have some shame, yes it was petty, but there was no reason for her to add me into it) she claimed that me responding to her friends was harassment, and she told me that I should take accountability for it. I honestly, didnt care, I think revealing someone to nude pictures without their knowledge is far worse then a light hearted, almost playful, "have some shame". So I, yes im petty, ignored her, walked downstairs.

She follows me downstairs, screaming at me and calling me slurs, saying that im a harasser for sending messages in the groupchat and blaming me for giving her a panic attack when she saw me message in the groupchat. I told her to leave me alone, and stop harassing me, it was mocking, I kept repeating it over and over again to use her own logic against her, so shed leave me alone. I was being cocky, but I wasnt getting mad or verbally aggressive with her, she starts screaming that I never listen to her, I tell her that ive heard it 1000 times and im tired of her lies. she proudly declares she deleted my projects, I tell I already started a new one, So i dont care, she says good. She then goes on this whole tangent about how nobody in my family loves me, how im worthless and once my family sees through my "lies" they wont love me anymore, she says im insecure, lonely and manipulative, she says this is the reason why I dont have any friends. She goes on to call me the devils reincarnate, says that I had a master plan to make all her friends stop liking her (they stopped liking her because she sabatoged their reputations with blatant and lies, called them slurs, horrible names, blocked them everywhere, started a whole smear campaign against them i swear then expected them to come back to her. they disliked her for a reason.) She just said alot of awful things about me but I wasnt letting it get to me, I pointed out that she physically hurt me during an altercation, where she involved my mother, who looked at all the evidence and realized that my sister was lying once again, when my sister got caught, she pulled out her phone, recorded me, screamed and berated me, then threw a very thick dog treat that ended up hitting my head. I told her that somehow she finds this acceptable, but me messagign in the groupchat was a crime, she tried to go back to the groupchat, I told her I dont care, and I dont have anything to be sorry for, it was petty and stupid yes, but its not nearly as intense as anything shes done (PETTY I KNOW!). She cant win the argument because im tryna act like nothings getting under my skin, she screams that Im a worhtless loser as shes going up, I respond more mad this time, I say that she is the jobless one with no education so who is the real loser, she then screams "atleast im not ugly!" i asked her to repeat herself she calls me a "chud" and runs upstairs.

I told my mom word for word what happened, and my mum confronted my sister about it, and guess what my sister did. She told my mom that I lied and none of that happened, she told her that I started a conversation with her so (??) i couldnt hear her point, but she was denying everything, saying that I lied to gaslight and manipulate my mum into sympathizing and feeling sorry for me, then when my mom called her out on her lie, she screamed off the top of her lungs, got extremely aggressive, insulted me some more, then ran off.

Ive been spending time in the basement because im afraid of her temper and want to be left alone, ive been doing my homework and studying. She comes down, says that I am fat once again, says that I am hogging the tv (mind you, theyve been using the basement tv for three days in a row now), i tell her its not a crime to enjoy the new watching space she gets mad once again because ugh its alot of bickering, then she gets mad at me for rewatching invicinble, she calls me a "larp" (which means poser in the new age) and gets really mad that im watching invincible its so random, shes more mad about that then anything else, then she storms off.

What is her problem. Im also worried cause I was venting on my instagram account (THE NIGHT BEFORE) about how I felt lonely in the family cause everyone had their person but me, and then shes bringing up that im lonely unloved and nobody in the family cares about me. Do you think shes watching my instragram stories on my private account somehow? Im being really paranoid, sure, but shes been logging into all my stuff and that was like so ultra specific!

she even went through all my text messages with me and my mum! so i'm terrified to know how much control she has over my stuff-- I changed the passwords for now but I still feel paranoid as hell! I can't believe I trusted her with so much of my sensitive information. Its not the first time we got into a small argument which she escalates and tries to do anything in her power to hurt me! she's literally used her long nails to dig very aggressively into my arms when I told her that mum told her to take out the trash once, its not unlike her to get aggressive with me but it gets annoying when she cried harassment over a discord message but she physically hurts me, stalks me and is just creepy! She even admitted to me not even a week ago about how she dosen't actually care about any of this stuff she's just annoyed with me and everyone! so like-- what do i even do! this isn't even emotional its for the love of them game!

Do I just ignore her again? Im honestly scared of her.

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