There's only one logical answer to this problem, and it's not legal advice. Move. Nothing good is going to come out of this situation. The last thing you need is this person accusing you of a crime--what if she makes up something and has you arrested via a citizen's arrest?
Get out--far away. Buy a new router.
Important things to remember: 1. The fact that I answered a question that you asked me on line, doesn't make me your lawyer. 2. Opinions are like noses--everyone has one. I just happen to think my opinions are right, but check with another lawyer too.
Give her a thirty day notice and get her out. During that period, limit your interaction with her, do not go into her room for any purpose, keep good notes of what you do daily, because you cannot trust her not to make some sort of accusation against you.
You may want to make sure you have witnesses around in case you do have to interact with her.
Sounds like a bad situation. I wish you luck. You are probably going to need it.
It might be worth it to hire an attorney to make sure you do everything right.