I'm so sorry you are going through this
adults in general suck and they never understand. the best thing you can do (in my op) is just talk to someone else. anyone who you're close to.
try to be rlly nice to her and do anything u can to make her feel guilty enough so she fucking stops
I have a really bad and abusive father and I honestly just try to be the 'good kid' in the house. I'm also the oldest so I'm usually targeted and yelled at aswell so I know how stressful that can be
if she's invading ur privacy don't fucking let her because thats not okay. my dad constantly made me uncomfortable too and he stopped once I threatened to tell the cops. I really hope this helped and hang in there
remember adults just don't get it and its NOT ur fault
ilysm I rlly hope it gets better for u <3/p