My hen is hopping on one leg and has yellow droppings

[1 chill chicken]

I need from people who have more experience with this than I do, just 2 days ago my Orpington started limping and we saw no injury what do ever and just today I noticed yellow droppings from her and in really concerned about her, any help is greatly appreciated

 

[MROO]

You might want to move this query over to the Emergencies / Diseases / Injuries and Cures Forum. You're likely to get a better, more rapid response.
Good Luck!