Private Property? How can you help me idk what to do im only 16 years old and isn't sure of a few laws.?

I am 16 and my parents and I live on the same property as our landlord/my dads friend because the house is sort of like a duplex. Now my landlords girlfrend her daughter who is 22, her and I use to be best friends. About a month ago, I had made a mistake and I lost control and I started pulling on her hair and I slapped her. Yes I will admit that part was my fault, but there were other things that she did as well, she took advantage of me alot of watching her 3 kids. And in the beginning I was fine with it and everything, but after awhile I just felt used. And today all my mom did was look at her and my ex friend said why the dirty looks? and my mom started sticking up for me...Now I was wondering if theres anyway to have her kept off the property even though her mom stays there with our landlord. My ex friends moms real house that she is signed legally to be living in is somewhere else. I just don't want any trouble and my ex friend is a drama queen and my mom is 17 weeks pregnant and I don't want that stress. We were litterally cooped up in our own house just so no serious fights were starting. I just don't want any trouble.