I would saddle her and put her on a lunge and WALK her for about 10 minutes, pick up gait for 5 minutes and walk for 5 more. I would start off doing this every other day for a week or so then pick up the tiimes by about 5 minutes for each part of the above. After maybe 3 weeks get on her and start at the beginning and build her up. I have done this, yes it's time consuming but will give you a good idea how she is doing.
Good luck