Thanks so much guys. So I've been reading a few threads based on what the vet said yesterday and it's sounding pretty serious - peritonitis 'cause she's an internal layer??? Given that she's deteriorated over night I've made an appointment with an avian specialist for 11:15 to get some more advice. I don't want to risk her life by 'hoping' the antibiotics work. It sounds like if a bird is an internal layer then they always will be and the problem will continue throughout her life!! I might just go with a hysterectomy?!?! Anyway, I'll know more in a couple of hours so I'll keep you posted.