I just wanted to share my story, too. I was a world class athlete most of my childhood and puberty, which resulted in delayed puberty, and I never did get very big hips or breasts or a "womanly" figure in general.
At the time I got pg with my first dd I was 5'4 and 108 pounds. Over the pregnancy I did a lot of walking. The last month of pregnancy I did a lot of squats to open the pelvis. My baby was born after 8 hours of labor and crowned very easily. Just a few pushes and she was out (I did get cut b/c her heart rate was way too low due to compressed cord). My second baby was conceived when I weighed 112 pounds and she came out pretty much by herself with minimal pushing from me. About 3 pushes I think.
So just becuase she has small hips now, does not mean she cannot birth a baby. The hips should widen and the joints and ligaments will soften in pregnancy and open up further in childbirth. If she seems to have trouble pushing, she should consider the squat position.
My hips never did go back all the way after dd2's birth. I have lost all but 8 pounds but my size 4 shorts and pants are history thanks to my new hips.
