Family drama with baby coming soon.

Little back story I’m 23 with rainbow baby. Due any day now. I have one person my sister that is pissed and mad at me because I don’t want she in the delivery room. I also don’t want her watching my every move with my baby. I want to be able to learn stuff on my own. Of course if I have questions I will ask. But me and my husband want to figure our new life out the way we want it. My mom and aunt are so supportive and understanding. I want my mom in the delivery room with me and my husband but that’s it. What can I tell my sister to make her understand? She has two kids of her own. But she seems to ever want to be alone with them. If her husband is not home she is at my moms and my house. What can I do??