Did anything come out from under he plug or was it just the cover that came off? If it's still puffy, soften the hole again with epsom saltsand try to push or (CAREFULLY) dig out any pus. In a cicken, pus usually looks like congealed petroleum jelly - thick and icky. Once you get the "head" poking out of the hole, you may be able to pull it ot ... veeeery slowly and gently ... with a pair of tweezers. .Well, now I know that chickens can like spa treatments.
Plug has been removed for a few days. Unfortunately, it's now more obvious it is just her right foot causing the problem. Still won't put pressure, just hangs the leg while walking and barely skateboards with frontmost nail for a tiny bit of forward momentum
Nothing noticeable at all on her.