Sorry to hear about your fall as well, I hope you (and your back) are ok! I would try free schooling her to keep her in active work while you are out of action, as she can still have a really good workout while you are under no pressure whatsoever. Stand in the middle of the area and use voice commands (backed up with a lunging whip if necessary) to get her to do 5 mins of walk, 10 mins of trot, and 5 mins of canter on each rein. This will be a good 40 min workout which will help her fitness and weight loss. When you are back in the saddle, I would also recommend lots of hill work when you are out hacking, it is great for getting horses fit

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