Advice needed - chick not well!!

 Hi, I am a new member to this site and hope someone can give me some advice. One of my Bantams, a white Cochin, Pearl, has stopped laying.  She is still eating & drinking, but is not as vocal as normal.  She had a small prolapse about 10 days ago, which i popped back in, again 2 days later.  She has had a bit of a mucky bottom, which i wash off.  I noticed yesterday and again today that she has a bit of yellowish liquid which looks similar to puss around her rear end, and she seems to be clenching and relaxing her bottom when i have checked her.  I am really worried that it could be Yolk Peritinitis or similar - any help or suggestions? 

As Joyfull says take her to the vet. 

Are you sure it's pus?  It could be the yolk that's coming out and the egg is still inside her, especially if it's a soft shell which she's having trouble passing.  Can you see any shell at all?  While you wait for the vet's appointment you could try giving her a warm bath (and put a bit of vaseline on her vent too) to see if that helps her pass the egg and then dry her with a hair dryer on its warm (not hot) setting.  Mucky bums can be a sign of worms too but regular treatments with Flubenvet will sort that out.

Good luck with your chicken and welcome to the forum even though it's under difficult circumstances. 

Ffill a sink with warm water and place her in it. You can either clean her rear end with your hand or was with baby shampoo. after about 30 mins her muscles should have relaxed enough to pass any egg remain. Towel dry her off and then blow dry her with a hair dryer on a warm setting.

Thanks again for advice.  She is the same today, no worse or better.  Eating, drinking and scratching as usual, and out free ranging with my other 3 bantams at the moment.
I will try her with a bath and see what happens!!  Will let you know later today how it went.