Extra service? SERIOUSLY???? Perhaps she was hosting at a no-tell and worried that the 5-10 additional minutes for improved hygiene would eat into her hourly rental and run her over? Simple solution: Book enough time to include normal prep and clean-up. Not like water, soap, and towels don't come with the room.
Based upon your details, I have to agree with all of the other comments. That is the most ridiculous thing I've heard hobbying in quite a while! If it had been me, I would have been grateful that you spoke up and volunteered to get lickably clean. Yes, please do share this provider's handle. Sounds like the type who upcharges for everything and gives the rest of us lusty ladies a bad name.