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Gentamicin is an excellent product, and does contain steroid (betamethasone) so you don't want her to ingest it. It is particularly useful for bacterial infections. If you've been using it this long without results, I'd certainly try the Listerine/Gold Bond combo to see if you can break the cycle of her licking it, in order to give it a chance to heal. Gold Bond is effective on fungus. Your vet might want to culture it to see if there is yeast, in which case miconozole might be indicated.
Lick granulomas, common on the digits (toes) are so easily licked that it can become a habit for the dog to do so. Some dogs actually start them by licking the feet out of boredom. Prozac is often prescribed for dogs who cannot be broken of the habit. Keeping her busy in order to distract her from the licking is important. Offering her something else to do with her mouth, such as a raw beef bone, might help.