Freshwater dips are hit or miss. Some claim they work and others don't. Your best bet is to set up a hospital tank and treat her for her fungus in there. It doesnt have to be big even a 5 gallon tank would do for a clown.
It is better to treat medications in a seperate tank, rather than a display tank. Just in my personal experience, its easier and cheaper to treat a smaller tank than a bigger one.
Heres an article on the disease
http://www.tropicalresources.net/php...er_disease.php
Now that I read this article ans others, they say there is no known treatment for the disease. They say larger cyst will fall off over time. I would quaratine this clown until it disappears. Hope some of that helps you out. Good Luck! Brad