Mom is insisting to be in the delivery room

My husband and I had originally planned that he would not be in the room until the baby came out, then he would come in. I know others will disagree with this but it was what is best for us. Well now he will be deployed during delivery and on the other side of the world. I really just want it to be me and the medical staff in the room but my mom is insisting to be in there. I have a relationship with my mom but I just don’t want her there. I don’t want her looking at my ripped open vag, don’t want to worry about what she’s doing or filming or if she’s not feeling well (she’s a cancer patient). I just want to be alone! She’s taking full offense to this. Any input or advice? This is my first baby so I don’t know how to deal.