You gotta take her to a vet. Something this bad needs cortisone/steroids. A round of Prednisone.
Keep clean and dry too.
Also, I wouldn't be using the malacatic twice a day unless there's yeast. It will start to irritate. Just wipe her down with a paper towel after she eats and use the malacetic once a week to prevent the yeast.
Either way, get to a vet. They'll be able to give you something stronger to clear this up.