Matt seems a bit of a silly question to me,
surly its your living and that is why you are trained and know how to get rid of stains, and if she isnt willing to pay , why should you attempt to help, especially that she is likely to be unsuccesful.
I can understand that she is a past custy, and maybe a future custy but in my opinion I wouls put to her that she needs your service.
After all its a bit like me ringing a plumber and saying I have a problem with my heating, but dont want to pay, "can you suggest any thing " dont think many would be to pleased
Geoff