Well the revolution should have stopped in like Oct. It is probably hurting her. Burning maybe.
Booties. Try putting on back feet only to start (treats, treats, treats!). bring the other two, so when her feet hurt and she lays down, clean off and put other two on, when she gets back into her groove she may recognize as feeling better and like them.
Whenever G walks through salt (to cross road or something) I move him into snow to clean off. This generally results in ice balls forming in his paws between the toes and heel (not sure what the paw anatomy is called...lol), so I dig out the ice balls (with bare fingers), and he is up and boogying along again. I use on back only, at least I know which are affected if he wimps out.
He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion. - Unknown