My ex friend is spreading nasty rumors about me? What do I do?

She complained to me once a while back that when she was in HS girls spread mean rumors about her and all the girls were mean to her.

Truth is, she is mean to girls generally. She even sh*t talked her friends to me...Anyways. When she became very verbally abusive to me I cut her out of my life.

BUT now she won't shut up about me and is spreading rumors.

Truth is, I have a lot more REAL stuff on her.

How do I get her to stop? We are roommates and even when I'm in my room I can hear her talking sh*t about me in the common space. Our new roommate might even have bias against me now;. Help!
My ex friend is spreading nasty rumors about me? What do I do?
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