My 3.5 chicken is not eating nor is she very active. When ever I pick her up and put her back down on the ground she always loses balance and nearly falls. She has mites crawling all over her but I dealt with that by putting mite powder on her. Her cone has shrunk recently and its gone very red. As it is winter in the UK it has been very cold recently and i have had to bring her into the house to keep warm. Any ideas of what to do? I have been very worried about her but have no clue what to do.