If she is not actually in her nest trying to lay, I doubt she is egg bound. I've not had that happen to my hens. I know it can but I think it's more uncommon than a simple calcium deficiency. Sorry I can't be more help. @Pyxis
I was unable to copy the link, but just Google egg binding in pigeons and look for the symptoms. Difficulty walking is one of them but you should notice much more if that is the problem.