Door too small for Jersey Giant?

[eek]

Hello.

I am a bit worried about my Gingernut Ranger, Valerie.

She has had feather loss to her chest for sometime and stopped laying a few weeks ago.

I have recently wormed her, mite dusted and started adding supplements to food and water and sprayed with anti pecking spray but no real chang

Today I noticed one large white blistery spot on her wattle.

She also frequently does a rather strange wiggle/shake/nodding head type dance.

She still eats, scratches everything and anything - fights for any treats etc and did lay a small egg this morning for the first time in over a week.

Our other chicken, Noodles is fine - except she has also stopped laying.

Both chickens are approx 1 year old.

Any advice would be great

many thanks

Claire