If Madeleine is alive, I wonder how "reality" is being explained to her? Has she been told her parents are dead or they don't care enough to search for her? In that case, her "reality" is that she feels lost and is probably crying herself to sleep. Maybe she blames herself, or thinks she is somehow bad? No manner of "good treatment" could erase those feelings, and she is old enough and has too many memories to just forget her past.
It's true that "where there is life, there is hope," and children "thankfully forget things quickly," but when I put myself empathetically in Maddie's place, I would want to go home to my Mommy, see my Daddy and siblings, and then I'd want someone to lock the door (this time) and keep me safe.