I'm sorry Joelle! I have a bi-polar SIL (if that's what is making yours this way too) and she is very difficult. She caused alot of problems in the family 5years ago and I'm just now letting her back in my life. She is on the right med's now and is tolerable, almost nice The big factor is that my DB finally accepted it and got her help. It was a bad time for him. Avoid her when you can, and talk around her when she is there. Hope things don't get out of hand. Sending blessings and good vibes for the trip