My mare's mud fever was gone over two years and came back with a vengeance the day after her flu jab and has taken two years to shift afterwards! The final solutions was Daily washing with Sporadol shampoo (from the vet) or alternatively Fungatrol shampoo, I wet hair and let shampoo soak neat for 10 mins and gently remove scabs if they are ready to come off (they will darken when "dying") always rinse with clean water and dry well with a clean towel. MIld hibiscrub diluted on days you are not able to shampoo, use cotton wool or something clean. Udder cream contains chlorhexidine gluconate, Germolene to the rest of us, the ingredient which kills mud fever, in bulk it is cheaper. Use this daily, especially as a barrier immediately after shampooing and drying with a towel. Homeopathic Sulphur 30C tablets one every morning and one at night, do not give hard feed 30 mins either side of Sulphur tablets. Keep this routine up for 3 weeks and I can almost guarantee it should clear 100%. Most important to keep everything clean too, your hands, towels, sponges for shampooing, brushes, wash everything and if in doubt rinse in mild hibiscrub. The bacteria can survive a decade in temperatures as low as -20 so you need to be really careful not to contaminate or spread infection or leave scabs on the floor etc. Good luck.

why dont you try equi chaps when she is turned out, and put vasaline or a barrier cream on her legs in the mud. Wash her legs slightly mre often with the hibi scrub, and remove the scabs, try treating the cuts with savalon or an antiseptic cream, obv make sure the legs are dry first, then apply stable bandages when she is inside, also limit her turn out over the winter. hope that helped.