Sorry this happened to you, that really sucks. I’ve got kind of similar experiences. My brother was similarly nosy (especially on the internet like your sister - he would lowkey stalk me lol so I’ve given up having a public online presence), and I cut him out of my life. I hate it when they find out something about you that you didn’t want them to know and they get that smug, gleeful look on their face. At least, that’s how my brother was. I have a memory of sitting there and letting him flip through my diary because I was conditioned to let him do whatever he wanted so he wouldn’t explode in anger. Thankfully, I never really wrote in it because I knew how easy it was to open. If she’s told anyone else, that still really sucks, but on the bright side you might get some nice pride themed presents?