I wish I could give you some advice, but I can't imagine why she is doing this at this time, unless she feels the stress of all that has been happening, but what to do about it, I don't have a clue.
I'm sure someone on here more experienced will offer some advice, I'm so sorry I know how you feel and how worried you are about her destroying the new house. Can it be jealousy of Graham for some reason? This one has me stumped. I hope she improves before you move into your new house.
Jackie, Miss Daisy and Perry