Good news then that she's back with her parents.
There are obviously a lot of unanswered questions. I am curious to know how much the airlines/airports were able to help and why there was even confusion about the S.Pennington on the easyJet flight when easyJet ask for a full name when booking. It will be interesting to know how she managed to get on board two flights STR-AMS and AMS-MAN alone given that I understand she should have been accompanied being a minor (?).
Anyway let's wait for the full facts to come out before labelling anyone.
Hopefully in the future the air transport community can rally round quickly to help in such cases.