That is exactly what I was thinking. Put her new rate $3.00 a day higher than everyone else...if she questions it, say that you had increased your rate months ago...and that is what everyone pays. I had the exact same thing happen to me when I first started this business many years ago. I had made a the same deal with a parent and then she called me and told me she had claimed the income behind my back and that she was being audited. I ended our telephone conversation very politely and told her I would give her a receipt. I wrote the receipt out and waited for her the next morning. When she showed up...(yes...she had the audacity to actually come to my home )....I told her to "get the hell off my property, she couldn't be trusted and that I don't have people in my home that I can't trust or who are back stabbers....I went back and claimed the money on my taxes....
yes...I made a mistake ..should not have made that sort of deal with anyone and have not and would not do it again. Lesson learned....P.S. SHE CLAIMED MORE THAN SHE PAID ME AT THAT!!!!!!!!