I agree that this can be a good thing for D19. I also agree it has the potential to be a harmful thing for her. But really what relationship does not hold the potential to be either good or bad for us?
I feel she is in a place to experience things in life she may never get the chance to experience again. But I also see that these experiences may make it hard for her to ever be content with relationships in the future. But I think we all have something in our past that make it hard for us to be content within our relationships. The person that I have the fondest memories of never jet setted me any where. The person I had the best sexual relationship with never showered me with presents. But what he did give me was a feeling like no one else ever has. It is sad when viewed that I will never have that again but it is a good thing when viewed as atleast I did get to experience it.
I think we all have the something that makes it hard to except the normal relationships later. That someone that made us feel special somehow that can never be duplicated by another.