If you are dealing with velvet the treatments you're using aren't going to help, it's likely that the freshwater dip has offered her some relief. She needs to be treated with copper, Read this, velvet is a very serious diseaseHi i did a dip nothing came off...i have her in qt shes looking a bit better..but u know what they are like for playing dead ...only treatment i could get locally was api melafix & pimafix ..using both as recommended...goin to get a good look at her tomorrow...feeding her brineshrimp& garlic..plus algae wafers ...thanx for asking...lost an emperor last week but think she was attacked as she looked ok to me..
https://www.reef2reef.com/threads/velvet-amyloodinium-ocellatum.217570/