Animals and baby

Tiffany
So my mom is super pissed because I told her that I don't feel comfortable with my child (still prego) staying that night with her because of her dog. She has a pittbull. Her dog was slightly aggressive when she first got her. I like her dog but I don't trust it. I have 2 dogs but I know my dogs. She just says I want let her around the baby. But she's not locking her up. She's mad. Like really mad. What do I do? I don't hate Pitts just fyi. Their strength makes me very nervouse. And the dog when they first got her showed aggresstion.