Dont babysit on school nights anymore. Also, you can let her play in her crib put a show on or something, give her toys. This is a hard habit to break and she wont sleep if she sleeps in the day from being up late with her mom, and you cannot really break her routine that easily as a babysitter. Or you could try making it dark and quiet and putting her bed outside your door so she knows you arent there to take her out again. The more you take her out the more she thinks she will be able to convince her. The more you let her stay she will eventually learn thT shes not coming out and will stop crying.

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