@flemeth, it sure is a scary time when our little girls leave home and wander out into the world!
What's that expression I always loved...
With boys you worry
With girls you pray!
And boy did and do we pray! Even with our DD married to a wonderful man, great wife and mom...very successful career, Honey, I still worry!! I don't think that ever leaves us but yes, at your stage of the game, if we can loosely call it that, it's doubly scary.
As for teenage girls...they do become human beings again, at around 19. How's THAT for scary?
When they become moms, they realized they really don't know everything about everything in the world! haha!
Good luck to her and to you! :)