Is she really sensitive when you groom her? Like, does she try to sidestep away when you brush her sides? Maybe you could do some desensitize/sensitize work with her. Rub her sides to condition her to the feeling, but be sure to go back and do "I touch here and you move" exercises to balance it out. If you do all desentitizing, you'll lose that lovely "yes Ma'am" response to your cues, but if you do all sensitizing, you'll end up with a basket case. It's kind of hard to explain in words... I hope that made some sense.
Hope that your hip feels better soon! That just sounded painful reading it!