Hen has a cold?

All my other hens are acting normal ecept for my hen David. Shes ALITTLE sleepy and when i tried to pick her up she moved away as if it hurt. She made some noices (clucking sounds) which sounds nasily like she has a little something in her throught (flem?) after a few of her clucks she sounded normal. She has sneezed alittle the last few days but that was becuase she ate to much crumble food at once and sneezed it out through her nose she isnt swollen in thw abdomen so i dont think egg bound crop is empty at the moment. But i think she has a cold or something