I've given it some thought and I'm not going to let my sister move in.
What is your reasoning behind this.
This is my house and I hate living with other people.
I know that it sucks and you don't want others in your space, however, I think it's important to help your siblings when they are in need!
Honestly, I wish they wouldn't even talk to me.
Your sister needs help and despite your valid feelings, I think you should help her, at least temporarily why she finds a place elsewhere. In the meantime, maybe you can talk to her about your concerns about moving in and set boundaries when it comes to privacy and personal space.