Good Morning B., Our Gr son Corbin did that same thing for quite a while. When he did the ole man shuffle and held his hinny I knew he had to go, but was trying not too.
Cause there was pain involved. He would be constipated big time. We put pull-ups on too and when he napped he was relaxed enough he would go in the pull-up.
I knew it would hurt and I usually sat with him in the bathroom, holding his hands, singing silly songs or reading to him as he tried to poop. When he would finally at time he would have such a HUGE movement he would think it was from a adult, and he did have tiny bit of blood when cleaning him. We started giving him the Fletcher laxative for children when he gets like this. He does eat a lot of fiber, oatmeal, celery, carrots, apples. Drinks more water daily then milk. You would think his BM would be easier but they aren't. We do the 1,2,3 PUSH it out too....lol
Let her know you understand it can hurt, but only for a tiny bit and you will be with her. In my mind there is nothing wrong with the pull up until see gets more comfortable with the BM.. Corbin does great now so no more pull-ups at all. Yea he still says Nana it's gonna hurt, but I am right there with him doing the 1,2,3 PUSH it out...lol
God Bless and Best to you and your little Princess
K. Nana of 5