hi, we have 4 chickens who are coming up to about 9 months old, one of our chickens has been going down hill over the last 2 weeks and we thought this was due to the snow and cold weather we have had, she has stopped laying eggs, her comb has gone from bright red to a pale colour, she is reluctant to eat and drink and spends most of her time in her house while the others run around their run. now i have noticed she is doing this neck stretching thing and opening her mouth in the process. no other chickens are displaying these signs and they are still laying. i bought her in the house and put her on my table and she just stood there and let me stroke her which is unlike her. also one of the other chickens has started to peck at her. im at the stage now of just wanting to take her to the vets and putting her out her misery which upsets me any ideas? is this gape worms?