Frustration

Sorry I need advice and to vent. My hubs ex wife has been starting with us and manipulating their daughter who is 7. She tries constantly to get the daughter to want to stay with her on our weekends and plays games about it. I'm actually losing sleep over this and on top of morning sickness I get sick to my stomach when she pulls her shit. I'm starting to get nervous that I'm getting so stressed out. I don't want to hurt the baby. She makes my blood boil on a weekly basis. I love my husb daughter as if she was my own. And I know she loves me just as much. Her mother needs to see she's trying to hurt us but really she is hurting her daughter more. I had preeclampsia with my daughter and a little worried she could make my blood reassure rocket and set me into it all over again. Anyone else going through this?