My niece did this & it was usually constipation. I would maybe get it checked in case she needs help going
My daughter does this a lot and she’s 8/10 times constipated and really trying to focus on pushing. I’d get it checked out as my girl got put on laxatives x
Elevate her legs when using the bathroom. We have squatty potty’s in each of our bathrooms to make passing bowel movements easier.