Not wanting visitors for Christmas while 37 weeks pregnant

My MIL and I don’t really get a long. She loves 8hrs away but comes to visit a few times a year and stays for like 10-14days. She’s currently here and I’m going crazy. She really drives me nuts but wtv thats not the point.

She brought up that since I will be too pregnant to come to their town for Christmas that she would want to come here to spend it with us. I just nodded and said we will discuss more closer to Christmas.

I then had a conversation with my husband to let him know her intentions and how i CANNOT have her here while I’m almost gonna give birth. I want to be relaxed and spend time with my husband and daughter just us NO VISITORS before or after birth. He thinks I’m being selfish and kinda dismissed me. The last thing I want is for her to be around when I actually give birth if I happen to go early like I did with my daughter…

How can I explain to my husband and really put my foot down on this? She knows how to work my husband so I really gotta stand up for myself here. 😭

UPDATE after reading some comments: She has lot of family like her other daughters where they live so she wouldn’t be alone for Christmas of course! I didn’t really go into details about our relationship but lets say she is mean and pushy. Example I was telling her how my grandma has Alzheimer’s and its really hard on me and she answer bu saying how people with Alzheimers are so annoying repeating themselves and should just be placed in a home.

Also she is 80 years old so not trusted as a babysitter if I go into labor. Shes not even capable of lifting my daughter so 🤷🏻‍♀️