How is she doing this morning? Hope she is feeling and looking better
I really couldn't even gander a guess at how often you should do water changes at this point. If it were me, I would do a moderate one every couple of days, say 10% or so, and try to do this by gravel vacuuming, this way you get rid of the ick spores that are *hopefully* dying off and dropping to the bottom
and giving your little guys some nice clean water, too.
Just make sure to match the temperature in your replacement water, and to add the appropriate amount of salt into the new water, as well, so you aren't just continually diluting the salt content in the water. What's your temperature at?