Kiev sick

There's something wrong with Kiev. She's sort of breathing heavily, seems to be struggling to breath, a bit wheezey. Her whole body is heaving with the effort of breathing and she's got a lot of white poo stuck to her bottom. Have consulted chicken gurus and it sounds like a trip to the vets might be necessary for some anti-biotics. Unfortunately, chickens are particularly prone to respiratory problems and the books/gurus say it could be a cold, gape worm, heart problems etc. Fingers crossed.