You may be surprised the things our kids can hold and do.

My 4 year old was so backed up with poop when she was 2 years old, that her colon was the size of an orange, and it's supposed to be the size of a penny. So yeah, she could hold in a lot of poop.

Maybe your DD has a virus or just ate something. It's actually really good that it's coming out and making her feel better. I would only worry if this continues for a few days like that.