MIL weird question?

So, I’m not very close with my MIL. She’s actually my husbands aunt, but she and her husband (which is my husbands biological uncle) adopted him at a young age so he considers them his parents. Anyway, they’re pretty young (early 40’s) and have two kids of their own that are 8 and 3. Close to our kids age (5/2), but we don’t hang out much because life, and our kids barely know them. It’s a weird family dynamic.

This is mine and my husbands 3rd child, but she asked me about who would be in the delivery room this time. With my first two, it was just my mom and my husband. I plan on keeping it my mom and my husband for this baby as well. I am very close with my mom, and my kids love her. She gets them every other weekend to spend the night with her and they have a crazy strong bond. I plan for this baby to as well, which is why I don’t mind her in the delivery room. She’s also a huge help, and can handle the gory stuff when my husband can’t.

Anyway, I told my MIL and she seemed disappointed. Like I should have considered her. My husband thinks I should ask her, because the hospital allows 3. I do not want her in the room, we are not that close, and I just don’t feel comfortable. She is more than welcome to visit in the hospital while I’m laboring and after the baby is born, just not during.

I don’t want this to cause any tension between me and my MIL. Should I just ask her or am I right to say no thanks?