Movie about kid napped child and a teacher trying to help

I am dying to find this movie that I briefly saw a trailer for.

Basically, there was a teacher (or daycare worker) speaking with a little girl and asked about a band aid she had on. The little girl said her mom called it something like a ugly spot and she wasn’t allowed to let anyone see. And somehow the teacher eventually realizes that the girl was a kidnapped child and the “mother” was her captor.

Please help!