Limping chook

Can any one give me any ideas as to what is wrong with goldie she is limping I cant see anything that could be wrong no visable signs but does look slightly redish around the toes and upper leg ? could this be an infection somewhere. she is lifting her foot off the floor ? and has slight limp when walking although it works a treat when I need a closer inspection and on the chase  then i think was she limping 

Feel the joints that are red.  If there is any warmth there she may have a joint infection requiring vet treatment.