I also think if a teen were pregnant. To have an abortion or to go the adoption route, will leave the teen deeply scarred. That is just the way it is. They have to make peace with it.
I think keeping the baby will obviously change a teen as well, but the little bundle of healing salve may help. But, (big but,) that depends on the coping ability and support, of the new mom. A teen mom needs major support. I've seen some very bad situations, for mother's and child's welfare. And if the mom remains resentful, healing never happens, and the relationship is never "right."