It will take time for her to put on body condition. I would continue to work on bringing her back up to a healthy weight, and in the 3-4 days prior to her next feeding day give her 15-20 minutes of light exercise every day to improve her muscle tone. That exercise could be done by handling, by setting up a perch for her to balance on, by swimming in lukewarm water, etc.
You can also encourage her to strengthen her muscles in her tail by gently running your fingers down her sides, almost like you are tickling her. When you do you should see her muscles tighten up and then relax.
Also if possible upsize her enclosure and give her stuff to climb/perch on so she can self-exercise.
You won't see results overnight but I bet in six months you see improvement.
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