I agree with the idea of driving home the idea that it's best not to get pregnant in the first place but would also emphasize that she is not holding herself in high esteem if she has sex so early or too easily.
As for the argument about trauma, recent medical studies show that women and girls who have abortions have the same depression as women who miscarry. The difference is that the women who miscarry have more open discussions about their loss and have a better chance of getting better.
Also, my brother was adopted. His birth mom was a teenager and from what I learned, I can't even imagine what her mother put her through. We added my brother to our family, who is a good "kid" (yeah, he's grown now, but there you go). She became a veterinarian and built a happy life and a good family.
My brother contacted her and at first she was reticent about having any contact with him. But her children, siblings etc were thrilled to have another person in the family. Eventually she warmed up.
I guess what I am saying is that yes, there is pain and no, there isn't a magic way to make it go away.
But the world is a better place for her and us because she did have my brother.