If she's really vicious, then my best advice to you would be to dump her as a friend. I've had friends who have been like that in the past. One friend's name was Autumn, and we were best friends in kindergarten. Unfortunately, when we reached high school in 2008, Autumn made fun of me behind my back with a friend who moved away via the phone, and my mom intervened. She told me to leave it alone, but then later that year, my sister was ripped off by Autumn during a trip to Adventureland for her grade in middle school. Autumn had problems that I wasn't aware of until Winter of 2008 when she made fun of me on the phone. I didn't talk to Autumn again. Either way, Autumn was more vindictive despite her troubles, which is why I am telling you. If this woman is worse than Autumn, than I recommend you break the relationship, and make it clean.