My bf’s daughter has issues with me. She’s 11. Her mum died 5 years ago they were not together and now she shares her time between him and her mums mum. I have tried to be nice to her and never have I wanted to take over the mums roll I have 4 children of my own. Sometimes she will be nice to me normally when she wants something , but most of the time she screams shouts and tantrums when I turn up at the house. She has growled at me, pushed me , told the dog to attack me and hid my stuff. The dog attack and hidden stuff you denies. I get very anxious when she is about cause I don’t know when she will flip. She has done this in the past in front of people too. When ever I answer any question she always says I’m wrong even down to what day it is ! I think she needs some kind of councilling as I’m sure this behaviour is not right. She talks to her dad like she owns him and in a horrible tone as well sometimes. When we are talking she interrupts. I’m at my wits end how to cope with this. He wants to move in but I don’t want to feel uncomfortable in my house around her. Any advise please?