Keep in mind there's taxes to be paid on that. Plus stylists don't get options like insurance, 401k, no paid vacation time, no maternity leave, sick pay, or any other benefits offered by most businesses. Heck most stylists barely get a chance to eat. You'd probably begrudge her lunch too. Or maybe you wouldn't. Maybe it's just her making more money for herself that gets your goat. Whatever reason you need to quit pondering her income. It's really none of your business. If you like her and care about her as a human being you should want her to make as much money as she can.
If your hair isn't turning out tell her. She's assuming you like your hair so why would she make adjustments? If she doesn't adjust accordingly after you voice your concerns maybe time for a new stylist.