Can you soak the foot in warm soapy water or even some epsom salts, then give the bottom a scrub. It's hard to tell if that's dirt/debris stuck to the bottom of the foot or if she has an infection like Bumblefoot.
Photos of the tops of both feet would be good as well and of your whole hen.
She is molting, those prickly feathers are new growth. What type of food/treats do you feed?
You mention she is in bad shape, is it just because of the way the feathers look, the slight limping or is she not eating/drinking, is she isolating herself - tell us more about why she is in bad shape.
Photos of the tops of both feet would be good as well and of your whole hen.
She is molting, those prickly feathers are new growth. What type of food/treats do you feed?
You mention she is in bad shape, is it just because of the way the feathers look, the slight limping or is she not eating/drinking, is she isolating herself - tell us more about why she is in bad shape.