Hey, fungal infections that are treated properly are typicly not deadly! If it is just fungus than treat it and see what happens. Fungus is a comon infection. Jungle Fungus Clear has worked for me. Just follow up with some water changes and some stress coat (avalible at most fish stores).
The good news is that Jewel (seems) to have gotten better. i seen her eat for the first time in like a week or moore. used brine shrimp which she is now refuseing..!! ugh and yes i even seen a small amount of dung on the bottom of her bowl. . I don't understand whats really going on with her. She won't eat anything off the top of the water. and now refusing the shrimp, anyhow she apears to be doing better