I honestly do not know how to stop this!

So I’m currently living at my mom’s house until we find a place, right. Since our lease ended and it was just one bedroom and 1 bathroom, we did not renew. I do not know how to stop this. My mom just yells “GRANDMA’S BABY” in Spanish and scared the heck out of my baby girl. My baby either jumps or cries or both. I told her to STOP doing that and she does not stop. She keeps on. I do not want my baby to get traumatized or scared asf because of her. And she does not listen to me that I am her mom. Makes me wanna smack her, but that is what I hate of my mom. It seems like if she enjoys scaring my baby and making her cry because she won’t stop yelling that to her. She does it like in a loving way not yelling to mistreat her but I don’t like it. She can say it other ways no need to yell and scare the baby each time. What do you think I can do next? She won’t stop, I don’t know how many times I have told her already to stop and don’t do that to my baby but she still keeps on and on! Then she laughs and giggles when the baby gets scared like be so for real right now! Fuck wrong with you! I just get so pissed off!