The grey here is that both alternatives stink. Abortion is bad, and so is a child having a child. Especially since she has a stated desire to keep it if she gives birth.
Either way the baby loses. Yell and scream all you want about life, that's fine, but just acknowledge that the alternative is no bed of roses.
Oh, it's pure crap. Truly awful! Whereas killing the unwanted is a bed of roses. Why, then there's no more crime . . . indeed, no more suffering at all. What we really need to do is kill EVERYBODY. That would give humanity pure Nirvana. (Maybe we should starve people, a popular mode of taking folks out down in Florida, and one widely regarded as euphoric.)
Parenting in an ideal situation, a classic family unit, is seldom a bed of roses. I'll stick with the less lethal thorns.
I've said it before, I'll say it again--if the girl has her baby, she will most likely (and quickly) lose her parental rights.
This girl needs help. Abortion is NOT going to help her.