+1I wouldn't get too invested in the conversation just now. It sounds like she is neither in a relationship nor looking to have children at the moment. People say all kinds of things before they're actually IN the situation.
I'll adopt, having a baby hurts too much.
I'll adopt, having a baby ruins your body.
I'll adopt, after I've had a few "of my own."
I've heard versions of all of those.
Lots of things could happen. I would say let her talk, because it's obviously a subject that's important to her and whatever this physical trait is it is a big deal to her, but don't get really invested because in the end, most people DON'T adopt (and really, it's up to her and her partner anyway). It's a difficult process. It's expensive. It takes a long time. Infants are rare, older children often have issues. You don't just sign up and someone brings you a sparkly fresh baby.
I'm in favor of adoption, my brother and SIL are waiting for a child right now (although it's going to be a long wait, even though they're adopting from the over flowing foster care system, they will consider special needs, sibling groups, and children up to age nine). But it's not as easy as just saying, "oh, I think I'll just adopt."
A lot can change between now and the time she's ready for children.