Gotta totally agree with the chiropractor, and making good time with her. Also, check the fit on the saddle anyhow. Since this is your first spring together, you may want to have someone else buck her out for you, or lunge her really REALLY well before you ride. I have to do that with one of my mares every spring, and a few times through the summer if it's been a while since I rode her. She also demanded a large amount of time for grooming, with the radio on & seemed to enjoy my singing to her (poor animal must be touched in the head.) ;)
Ask Often, Demand Nothing, and Reward Generously.