First Right of Refusal

According to our decree. I have first right of refusal,my ex works on Mondays and I don’t.The ironic thing is my ex works at a day care/learning center.

My daughter is enrolled in this day care/learning center. I asked her tonight if I could have our daughter on my day off because of the decree giving me first right of refusal. Her response was that was her time and she said no.

What can I do? Any one with ideas please help. Has anyone been in my shoes?