Ketrin also was wrong when she thought that her secret place is real secret.
Stranger found her playing wth Dana and he decided, that two packed girls is always better than one, especially when they have their own trash bags and duct tape.
So Ketrin was soon tape tied, gagged and packed in trash bags next to Dana and both girls were hogtaped in water and left for struggle.
Later they can get free, but not so soon.