This is my ranting and venting here, but it is of sympathy to what you're going through.

A workplace is a co-operation place.
I don't care what someone is going through in life - if he thrashes, stomps on people, cheats or takes other sorts of actions, especially by motives of self-interest, they don't deserve any recognition.
From my previous work place, I've learned this. My tolerance to these kind of people has been greatly lowered, and I feel like fighting those kind of people back. They don't deserve to thrive beyond the co-operatives.

Now for my suggestion:
Don't fear. Keep fighting her in whichever way is right. I'd advise you tell the supervisor her behavior makes you feel horrible, which disturbs and lowers your performance. You can also include others in the equation if they are also affected by the woman's behavior, which can make the supervisor see you as a very responsible worker who speaks in the name of others.