It looks like pox especially from the pictures of the wattles. Keep looking for any yellow plaques inside her beak, that could be a sign of wet fowl pox.
What you are feeding her is not a balanced diet, and it does not have enough protein. You would be better off feeding a layer type feed or a flock raiser feed (plus crushed oyster shell available for free taking.) Her diet probably has nothing to do with her illness, but your chickens would be...