N.B.
Is this a reimbursement account? There is often a form from them for the provider to sign? Not always (I wish it was more standarized!).
I would make sure you get a reciept from her. You just need some sort of statement of payments from her. In this day and age of computer programs of all sorts for recordkeeping, this should not be a such a big deal, I would think? I am able to go into a specialized program I use for my home childcare and just print a wide variety of things for my clients.
You need to be sure you BOTH are claiming this same amount for the time period. If she "doctors" the form (not saying thats what you are doing...I am just speaking in general here, so please don't be offended), so you can get the rest of your money out...then she needs to claim that as income and pay the taxes on it..plus its illegal to do that unless she actually got paid that money, etc.
Usually the forms you have want a signature, or at least the providers name and either SS # or their EIN, if they have one of those (I do the EIN so I am not handing out my SS# all over the place. Its free and quick to do online...you could tell her that!)
Good luck!