AITA for wanting to go low contact with one of my siblings?

I (20 f) was talking about growing at least low contact with one of my siblings indefinitely with my mother.

In the past year I have been attempting to take steps to put up healthy boundaries for myself so that I can make my mental health a priority. I started trying to really crack down on this because I slowed down to figure out some health issues that started up around two Christmases ago, and began to get herassed by one of my sister's to find a job and do it quickly

(Me not having one was not for a lack of trying).

She's the type of person that you give an inch and she takes a mile. I found that the things I had shared with her she had been sharing with anybody she liked and would listen, (mainly her close friends). Of course I knew these people as they are also within my friend group. She had essentially been talking to them about how she thinks I'm so annoying to them, when I asked her to stop she said "no, you can't stop me from talking to people!"

I reminded her that normally no I couldn't but this was private information she divulging but she didn't care. Furthermore she kept pressing that she somehow had a right to my private information, even if it really does not effect her and doesn't live in the same house hold.

In the moment things already felt as if they were spiraling out of my control so I even took the chance to confront her on her manipulative and gaslighting behavior (this conversation was just feeding the flames of times I could list off). As you can guess she didn't take it very well and started trying to convince me that it was not glass lighting or manipulation and proceeded to call me a privileged spoiled brat for asking her not to talk about my personal business and trying to set a healthy boundry. I ended up interrupting her whole rant by saying "well to bad, it is gaslighting."

Then promptly hanging up on her and blocking her on all platforms.

She has shown this type of behavior over and over throughout my childhood and proven over and over that she is not to be trusted. And of course I came across something where someone talked about forgiveness saying it can look like saying I forgive you while walking away as to not give them the opportunity to continue causing you harm. When I told my mom this and my plan of low contact for now and possibly no contact latter in life when I'm able to get even more distance between us she immediately started trying to convince me that I shouldn't do that as she is my sister. But I still feel more on the fence about that, besides blood is thicker than water. I want to know AITA?