#sol lay

This seems pretty spoilery; it would probably be better to let her discover that herself.

This definitely seems spoilery; the bit about gender not affecting reproductive capability isn't really stated until the troll romance exposition.

I'm not really sure what the stuff about gender parity and "a really good plot reason for existing as male" are referring to, but… well, it's obvious the kids and trolls are balanced male/female, at least, so it doesn't seem super spoilery.