She doesn't have to sit on them, they are just there.
There were times I thought I would have to towel Sakie off her nest of balls.
She sat pretty tight when nesting. She did finally learn that "eggs" was not an excuse to not come out and work for an hour. The week she was laying them I was easy on her, I made her come on stage but she didn't work. She is pretty bad though, sits tight enough to not eat or poop so I have to be tough on her. Cha was that way too.
Rosie sat but always wanted out. She would eat fine, poop fine but felt obligated to sit on the things. Nikki would lay eggs from a top perch so they would splatter 4 feet in every direction. If I gave her dummies she treated them like step children. Never wanted anything to do with them. She sat on beads and small balls but never an egg. They are all so different. It's whatever works the best for Koko to get through it.
Rosie would get off the nest a few days after they would normally hatch. I had to pry the dummies out from under Sakie's butt to get her off the nest.