Would a former employee of the hotel kidnap a child guest to make her employers look bad? Sure, I guess. But now you've got a kidnapped child on your hands. What's next?
Would she have planned to allow the child to be found and maybe something went wrong? It's awfully complicated and not very personal (in the way that an employee of the McCanns kinapping their child would be). Easier to talk down the hotel and her bosses on internet message boards, really.
Use her, sell her or kill her...
Happens all the time ---