ChildCare write offs

My mom watches my seven month old baby every day while I am at work and I pay her at the end of the week for babysitting. She is in the process of applying for Disability due to back injuries. Will I be able to claim those childcare expenses, without messing her up on trying to get her disability started? She informed me that she is not going to report it as income on her taxes, but I want to be able to claim those expenses. Is there a way to do that?