Quite a few of you said to talk to this hotel or asked if anyone had talked to her about her situation..so I asked if anyone had. Turns out the manager and several other employees have talked to her about it.
We work in a hotel and both she and I are breakfast hostesses. She used to bring her while family in and they would eat breakfast until the manager told her she could no longer do that. Sometimes her mom would come inside and leave the girls in the car. According to a coworker they will even leave the car running and the windows are rolled up.
So since none of them care I will be calling the police the next time she brings them to work and leaves them in the car.