You're not being petty - she is a major pain in the ***! You have enough of your own responsibilities to deal with, which reminds me that as Alfee or someone said, SHE IS NOT YOUR RESPONSIBILITY!! I know it's hard but try to ignore her. Downplay her dramas. Too bad one of you can't move. We are here for you. Hang in there and THINK ABOUT YOURSELF for a change. You're worth it.