She is refusing to come over - thank god

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I dont know what all is going on, and I am sure it's not because of just me. Now on Christmas for a few days my younger brother's girlfriend was here. We had company earlier, but they had all left, my parents even said she was gone. Now my parents don't shut the bathroom door when they go so I assumed she was gone. I was in the bathroom brushing my hair, brushing and flossing before bed. Mind you it's bout midnight by then. So I was spitting my toothpaste out, this is my bathroom. Whys he came down,when noone was upstairs is beyond me. Since the upstairs bathroom is right above this one nad you can hear people go in and out, or flush the toilet. She stood there a few seconds staring at me, seriously never seen someone brushing their teeth. She then stomps up the stairs, and tells my brother. She then refusing to come over because she walked to the door while I was brushing my teeth. I am laughing over this completely, my Dad was telling me this. How my brother came downstairs and yelling at them because I dont close MY bathroom door while brushing my teeth (which I never do - so why is it a big shock). My Dad goes my brother was being very rude to her, saying comments (while I was at work), he called her ugly, and fat (not straight out but in jokes or comments). I told my parents I am paying to be here, I pay for that water, the bathroom, and if you want to be technically I can tell her that she cant use it. My parents said they told her to go sh*t in a bucket in the backyard it was my bathroom, and knew if they said anything to me I would say something to her.