Weekend with N-mom & Lack of Privacy

I have to spend the weekend with my n-mom for a family event, and I’m dreading it. I haven’t been able to sleep tonight because of it.

Also, she called my apartment complex and got the security code for my building. She doesn’t pay my rent and has no right to this information. I feel violated and unsafe in my own home. Just when I started making progress towards my independence, she does this. I don’t know what to do. They gave her the access code to the building, I’m scared they’ll give her my apartment key next.