Well I suppose they could eventually do a C-section.
Isn't it that she is at risk for carrying the child to term? If so, then she won't survive long enough to have a C-section.
It depends on the girl doesn't it. Here is a 9 year old girl that delivered a healthy baby girl, both mother and child survived quite nicely.
Girl, 9, Gives Birth in Mexico - ABC News
It is a good thing that in this country we provide for medically necessary abortions. The age of the mother isn't exactly determinative around the world since there are many instances of ten year old girls having babies.