I have a brahma that is about 8 months old. She is not laying yet. Around Thanksgiving, I noticed that she stopped roosting at night and just stand quietly on one of the corners. I thought she was sick but she seemed to be ok. I posted her issue awhile ago, and the responses I had was because of her breed, they stop flying high due to their big body. So I thought that was the issue!! Well, the last couple days, she stopped going back inside the coop. So for the last couple nights, I brought her inside the coop, except last night. The temp last night was around 24 F! When I found her this morning, she looked very weak and couldn't walk! I brought her inside again and separate her with other chickens. I put her on pine shaving bed and put water and food next to her and also a heat lamp! She didn't seem to be interested in eating or drinking! Is she dying? What should I do next?