Hi.
Your starting with a small meal was a great idea - I would keep to small, more frequent feedings, at first and slowly move her up to the right prey size as her condition improves.
I would never go more frequent than 3 days between feedings though as that just puts extra strain on her system at a time she doesn't need it.
I would start at feeding every 5 days and see how she does with that. A few soaks wouldn't hurt to see if you can speed up the recovery from the dehydration and loosen some of that stuck shed after she has had some time in the humid tub you have her in.
Slow and gentle is a less risky way to bering her round to good health.
dr del