Unfortunately, she has adequate written confirmation, should she decide to just ignore my email--she showed the additional amount as a change request on the draw request invoice that was delivered Friday afternoon (so I could leave a check before going out of town). That doesn't change the amount of the draw request, which is fixed at 25% of the original contract, but it does mean she gave me an amount in writing.

I have sent my protesting email. We'll see if it gets any response!