Just take that baby with you

I was picking my daughter up from a party the other night, and since I am breastfeeding I didn't want to linger too long. Turned out they'd started eating late, so after they'd finished eating I'd already been there almost an hour. Finally drag her kicking and screaming to the car and we have this conversation:
Her: "Why didn't you bring the baby?"
Me: "It's a party, it's full of loud noises and strange people"
Her: "You could have left her in the car"
Me: "Erm, no, you can't do that"
Thankfully your average 7yo neither has kids nor drives.