L.M.
I would get a second opinion. I would take her to an endocrinologist or talk to your pediatrician first to see what he/she thinks about this. I have an 8 yo that is very small but I am not a big person and neither is my husband. My husband was a premie too, he has a twin sister. I see pics of him when he was little and omg was he skinny and they took him to an endo doctor and nothing was wrong. I would definitely get a second opinion. Although your daughter just may be a small girl but check it out any way.