Something that struck me after reading,

There are a lot of disappearances in which the hikers dont come back from this area, but yet your "daughter" was found. It seems shes special if she was taken and replaced instead of just missing forever. Maybe the replacement child is much like someone in the comment mentioned, shes a "replacement" of sorts? Maybe to test the ability of said species to learn,grow and adapt into the human race and eventually return to "home" and share.

Also, odd that when she was first found she wasnt trying to escape just enjoying the little burrow. But when you put her back she wanted out, Im not sure that youll find your daughter or ever get a swap back but seems like wherever your daughter is now, is not a place anyone would want to be