Thanks, from all the looking on this site we thought that might be it.
I guess the next step will be to soak her foot in Epsom salts and then try to remove the plug from her foot.
This morning we noticed one of our hens has a swollen foot, and is limping. (we have 20 laying hens total, no other swollen feet or limping in other hens)
Picture of our girl whom has swollen foot, above.
Picture of a close-up of swollen foot, above.
Picture of the bottom of the swollen...