He Teamed Up With His Family Against Her
It still boils down to communication. If she has scuffles against any member of your family, be aware that you’re treading dangerous water. Don’t ever say it was her fault, even if it was. Well, at least not in those words. Talk about the problem with your family, without her. Then gently find a way to make her understand, without any finger-pointing. That will take a lot of skill and patience.