Even if you think it's too late, don't give up in her!
Dropsy may be fatal 99.9% of the time, but she may be the .1% that survives.
The Epsom salt will help keep her comfortable. When my fish had dropsy, the salts drastically reduced the pineconing of his scales.
The only other thing I suggest for dropsy in addition to Epsom salt is an antibiotic. If it's not too late, it could really help. I used Maracyn plus (wide spectrum antibiotic) and eventually switched to a stronger medicine (Kanaplex). It's supposed to kill the bacteria that is causing the organ failure. Of course, my fish was far too gone in the advanced stages so it didn't help much for him. But I have heard success stories.
I apologize if I ranted on or told you stuff you already know. I just think dropsy is a delicate situation and uncomfortable for a fish.