Wow - given that most ladies are adamant about men showering upon arrival, as they very well should be, great to know some out there don't follow the practice themselves. If I were in your shoes I would have insisted and if she continued to refuse politely asked her to leave and take back any/all monies.
I've never been asked by an SP for a tip but MPA's have in a few cases asked. Last time I will see them.
I saw a note posted above about us paying the lady so she cleans up the mess we made after. I thought that was funny considering another SP posted something about cleaning hair out of the shower. Is there anything else we are required to do during our paid time? Should we make the bed, fluff the pillows, clean the toilet, do the laundry? Ladies, please follow the MP model - cleaning the shower before and after an appointment is your responsibility. You don't have to but I'm sure guys who see a dirty shower will not be happy and will write about it in reviews.