Colour of hen's comb is changing!!!

I don't think yours sounds as if she is dehydrated Pretty Chick.  Mine has definately been sitting in the nest box for a long time.  She started sleeping in the nest furthest away from the others at night as well!  Last night when I went to encourage the others to go in every time one went in the Broody growled at them.  This morning she didn't come out when my husband let the others out so later on I went and opened the nest box and encouraged her out which she did eventually.  She started scratching around and so I threw some pellets on the ground and she ate some, drank a little and then had a dust bath.  She is still out with the others which is good.  She also seems to be fluffing her feathers up and shaking them which I am not sure about.  I have a feeling she is broody from what the other members have said   I would rather that than her being ill.  It's the Buff Rock, Lucy,  which is the one that seems to be broody.  Now I have started the antibiotics I will keep her on them and finish the 5 day course.  I will also keep an eye on her and make sure she is eating and drinking!  Pretty Chick I am sorry I have taken over your post - I should have started another one.