Ya, your client was probably just as "in the dark" thinking that she was saving a few bucks by not taking reciepts. Until she saw her accountant and was asked if she has her daycare receipts. I hope you've raised her rates as well and she is not getting the lower rate based on no reciepts anymore.

This business teaches us all sorts of lessons as we go doesn't it? I hope you have a quick and easy solution and it doesn't cost you too much.