Poorly Thelma

Hi guys i need some help please.My Thelma is not very well she has got a comb that seems to have shrunk and turning purple/black and seems to have no energy. She has not got a runny nose or eyes(they are still bright) she is moulting and all the girls where wormed end of sept. she is still eating a small amount and drinking to.I dont think she is laying either. As she  walks it looks more like a duck but i can not see or feel any broken eggs or see any lumps and her pooh seems to be loose and a green colour and watery.I had to wash her bum today and she enjoyed the blow dry she does not seem to be in any pain either she is a warren(not ex batt) and is two and never had any health issues before cheers Andy

It would be good if you could isolate her until you find out what is wrong - just in case it is infectious.

Thankyou for the replys am goin to take her to the vets dont like to see her like this