For the amount of work you are doing, you are getting a fair price. If it was just a wash and a vacuum, then it might be a little much. But if you are washing, drying, waxing, doing the wheels, cleaning the engine, cleaning the interior, dressing the plastic, etc, then it's a fair price. You have to break it down into 2 parts... supplies and labor. Unless she is providing you with your detailing supplies, you have to factor that cost into the price, and detail supplies aren't always cheap. You also have to decide how much your time is worth and charge accordingly. Don't sell yourself short on that end, charge what you feel is fair, not what would necessarily be a good deal for her. Don't worry about how much she makes per year, that's not important. It shouldn't make a difference whether she makes $10k a year or $100k. If you want to operate a business, then set your prices subjectively. I do some contract programming work on the side, and I always charge the same for labor whether I am working for an individual or a company. And my labor cost reflects what I feel I am worth, based on my experience, education, etc, which works out to about $40/hour, and because of that, I don't feel guilty charging as much as I do. I charge what I feel is fair to charge for the quality of work and service that I deliver to my clients.
