>>4443119
Yes, but what specifically did she give back? Is it also a transaction if a homeless person just gets money for free? Is she now the bodyguard of her sponsor? Will the homeless person start cleaning the shoes of the kind nee-san? Or provide any other services?
Your phrasing is just wrong.
She was offered the girl for nothing in return, imho. We can assume she might protect the village or not attack them directly (a service of kindness) but we don't have a definite answer to that. At least for now.