Can you get us pictures?
Please also post her current tank specs, like the ones in the sticky in this forum.
Do a water change, and if you have it- add 1tsp/gallon of AQ salt. Change the water if under 2 gallons every day 100% and redose the salt. You can bump the dose up higher, but stick with it from 1.5-2tsp gallon for now if you want more.
If 3+ gallons, do a 50% change one day, a 100% another. If its a BIG tank, like 7+ gallons, do a 50% then 50% the next, or you can wait two days and do a 100%.
If you have a bubble stone or airrator, add that in to prevent bacteria from growing as much. Keep the temp down to definitley below 80', and try your BEST to keep below 77-8'. 75-76 is perfect to prevent growth. Keep her in a dark place.
Is it fuzzy? Cottony? Or just raw and her scales missing?