I know that your daycare income is your job--- but do you make certain allowances?

An example:

A friend cares for a few children in addition to her own and the parents of one of the children have just split and the father (gem that he is) is refusing to pay child- support until there is an order- even then I suspect it will be like pulling teeth)

The mother loves her day care provider but cannot afford the full fee without her soon to be ex's contribution.

My friend (the daycare provider) is considering letting this particular child slide on reduced fees for a bit- is this a bad idea? would you do it? What would you do in a similar situation?