My dog's sore foot

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Four months ago, my dog suffered a problem with her sciatic nerve and her whole limb (left hind leg) became paralyzed. Not really sure how it happened. Perhaps she slipped on the ice. Consequently she dragged her toes for several weeks as the leg was beginning to get better... Before I could even get her to the vet (snowy weather and icy roads) she had also developed a sore on the top of her foot. Now her leg has healed enough as far as the paralysis that she can use her limb more, seems to have more control over it, still drags the toes sometimes. But the sore on the top just won't heal. She just keeps whacking that foot into things. I am keeping it wrapped, changing the dressings daily, so far there is no infection...but ...it just doesn't want to heal and form fresh skin. Any suggestions???