Evicting a roommate who feels she cant be evicted?

From the sounds of it, as long as you give her the legal amount of notice, she can't really say much. Just the fact that you feel your safety is compromised due to her husband is enough reason right there. Do some research online, for example, google landlord tenant act and see what comes up. There are usually some 800 numbers that you can call for advice or to find out what your rights, and hers, are. Every municipality can have slightly different bylaws regarding landlord/tenant issues. Good luck!