I know that "Torment: Tides of the Numenara" is a story focused game and running with a child in your group is definitely an interesting experience, but besides the unique flavour, to say it blunt: is there any use for the runaway "Child who talks to gods"?
She has no combat stats, and so far I haven't seen anything else that she could do, except... well, being your adopted child.
Does she eventually grow into an useful party member? Or maybe there is a place where you can leave her safely? And no, I'm not talking about the slaver who is looking for her.
EDIT: I've just found this interesting guide: It seems that she can be trained into being quite useful runner/stealth specialist she can also work wonders with cyphers, because she can use any cypher twice in a row.