We had a cockerel with suspected fowl pox Rick. We tried all manner of treatments on a big scab on his comb (initially caused by fighting), none of which worked. It just disappeared when he was moved to France and the Wyandottes he was with in England were separated. Always been a mystery because there was never any evidence of pecking, so perhaps it was the stress of dealing with three squabbling Wyandottes and three squabbling Orpingtons? As you know, stress brings on all sorts of problems because it depresses the immune system, so anything you can do to minimise stress, be it weather or companions, has got to help. Problem will be with re-introduction and it may flare up again.
The articles I read from America said it was fatal and the bird should be culled. Not sure if theirs is the same virus though, as ours may be much milder in effect.
Are you sure this isn't a pecking injury that has got infected? Basil's scab was a brown colour and just grew over more of his comb without reason. We tried gentian violets, tea tree cream and others( which I can't remember), none of which had any effect whatsoever. In fact I seem to remember the gentian violets caused the scab to grow!
Avoid any tonic like Nettex Nuitridrops, because they are an emergency treatment and have sugars in the mix (for an instant energy boost) which can promote the growth of bad bacteria in the crop and intestines. I'd just give her a rearers pellet mash, which she should enjoy far more than dried pellets and she should gorge on giving her all the energy she needs.