Regretting my decision

I allowed my husband sister to move in with us so she can go to school here. I regret making that decision. She's a pain in my ass and I'm so mad that she feels like she has the authority to threaten my kids! She has already started some shit between her mother and I. She complained to my husband and her mother about how I would snap at her (and I did but only because she was yelling at my kids) and my husband know I have a mental disorder so he tried to tell her but idk what happened. Her mother came over last weekend and asked if I hit her daughter!! I looked at her and said "wow I hit you girl? I didn't know that" her mother said I'm kidding but I know she wasn't. She would call my car a piece of shit and would say my house stinks. Well if I had help from the women that's been living with me for 6 months would fucking help I'm sure it would be up to your standards! Btw my house is 10 times cleaner then her mother house!!! They let their dogs shit and piss all over their room and even their beds! So dont fucking tell me that my house is disgusting!!!

She tells her mother everything that happens in this house, and how much I'm spending her brothers money. She acts like i dont have a say in my own house and that my husband will have her back at all time! But no!!! My husband has my back because I come first now and it's our money not just his! I just want her to start school already and for someone to finally fucking hire her lazy ass so I wont have to see her 24/7