Wow! That's crazy. I would smile and nod in front of the parents, but put that pull up on for nap time. Especially if she's off to gramma's in a month.

I have a 3 year old that I still put a pull up on at nap time. I have 5 kids in my care, he's only been trained for a few weeks and although he has success 9 out of 10 days, I don't have time or the ability to clean it up on the 10th day with all my kids here.

He'll drop the nap and go to quiet time in the summer. And that's when I plan to fully drop the pull up.

I'm just not set up at this point to take kids to the potty half way through a nap. And my quiet time is toooo valuble to have it interupted by a bladder that's not fully developed yet.