Maybe you are a lot like she was at one time, and that might be why she is so mean. She sees herself! No one is perfect but I am sorry she is just down right nasty to you, that is just not right no matter what. I would go but just try to stay away from her as much as possible and maybe meet with your niece somewhere else where you and her could visit without your mom. Guess I wouldn't stay to long if it were me. I hope for the best for you. take care.