I hate my husbands daughter...and I feel bad and justified at once

🐢Mrs. Turtle🐢 • I`m a stay at home to my darling daughters aged 11, 11, 3, and son 10 months 💗💗💗💗
My 11 year old stepdaughter is a nightmare. I have never even referred to her as my stepdaughter but the way she acts is a constant reminder that she isnt my child. Shes violent, combative, and a complete brat. She steals from my mother, my other kids (one of whom is 2!), and me. She doesnt listen to me if her father isnt around because her mother says she doesnt have to. Shes hit me, my other two daughter, other kids I have had in my house, and even made my husband wrestle her to the ground because she didnt want to stand on the wall for hitting me and sending me to the hospital in preterm labor (I'm 29 weeks). We only get her for 2 weekends a month, 3 weeks during the summer, one week of Christmas break and alternating Spring Breaks but shes almost done with her summer here and its our year for Spring Break and I honestly dont want her to come back after she goes back to her mother on Monday. I am scared for the safety of my son when he gets here as she tried to dump my now 2 year old out of her swing when she was just a couple months old. No one saw but ne and she swire it was an accident, which is what she says when she hits anyone else. My nieces and nephews all dont want to come to my house if shes here because shes so mean to them and I dont blame them. Even my daughter is happy when she leaves because of how much of a total brat she can be. I am just at the end of my rope and dont know what to do anymore.