I see. Thanks for clarifying. Sorry you are in this position.
It sounds like you are in communication with her bf/your friend. What does he say about finding another tenant to take your place? Who is the landlord? Maybe tell your friend/her bf that if you and he are unable to find someone to fill this room before February 1, you are going to contact the landlord/building manager and see what you can do to personally to get out of this uncomfortable situation.
Sadly, I think if she has a total meltdown, the cops come, etc., you probably will have a better case for breaking the lease. Not saying you should instigate that, obviously, just that may be a side effect of that unfortunate situation.
Also, when I was dealing with a loco neighbor and doing a lot of internet research to find out my rights, I remember seeing that, at least in the state of CA, a domestic violence situation automatically invalidated a year-long lease, i.e. there was no way the landlord could try to hold a domestic violence victim in their lease, rightfully so. Not necessarily your situation and not sure if you are in CA...but it would be beneficial to do an afternoon of internet research on "breaking leases" and "mental health problems, etc."
If you honestly feel your safety is in jeopardy, don't play it down.
The good news is this will be over at some point soon and it will all be behind you. So hang in there.