Delivery room

My husbands mother asked him to be in the delivery room.... he kinda just didn’t answer because he knows I don’t want her there. I have no issues with her at all and we are all pretty close... but now she has gone completely psycho texting me stuff like “I’ll just step down and watch from the shadows.” I don’t understand where this is coming from and I really don’t know what to do about it. My husband seems to be taking her side because he claims he really needs support while I’m the one in labor... Any advice on how to handle the husband and/or mother in law?