Kids at a baby shower....

Tabitha
Looking for opinions and advice... 
My mom and step mom are cohosting a baby shower for me. My dads side of the family is huge. He has 12 brothers and sisters! Needless to say I have a lot of aunts and female cousins who also have little girls. I have been to all of their baby showers and they always brought their children with them (normally just their daughters). So I didn't think twice when I made the invitations out to them and to rsvp with how many total including children. It's normal to me. My step mom agrees with me. Maybe because she is accustomed to the large family gatherings with a lot of kids. My mother on the other hand is not thrilled at all. There was 83 people on the guest list total including children. Of the 83 invited 65 have said they are coming and of that 65 13 of them are children. When Ibgave her the numbers today she seemed very upset abou 13 children attending and had a bad attitude. My step mom paid for the cake and the hall and my mom is providing food (large party subs, taco salad, and veggie trays).My step mom has offered to help with the food expenses as well since a lot of the people coming are from my dads side of the family. My mom declined the offer but still has a problem with the children. The hall my step mom rented has a play room for kids as we decided that was a must when originally looking for a hall. My question is this: Is it really that uncommon for kids to be at a baby shower? Have you all ever been to one with kids? Any advice is helpful. My mom just seems to have had a negative attitude about this from the beginning. Starting with me telling her I'm pregnant. She has yet to congratulate me. Idk if the kid thing is really an issue for her or if she's just finding another reason to be hateful. It's really overwhelming and stressful... 😔