The worst for me as an adult is when I say I'm having problems of my own (not HER problems but MY problems) how she'd go on the attack and laugh at my pain. For a long time I could ignore it, I'm amazingly patient by most people's standards but she wouold use the most pleasant moments to get nasty and blame me for stuff or tell me things like its my fault my brothers can't stand to be in the same room with her for example. Nothing is ever her doing.
I don't know if its ever resolved but I'm determined it has to get better.