We had an extrememly cold night 2 days ago. 3 of my chickens died over night and 2 where barely alive. (All these chickens didn't sleep inside the coop that night) And all the rest (12) where fine (these slept in the coop). I worked on the 2 by attempting to warm them up -putting them in the sun and warming them with the hair dryer. Unfortunately 1 of those 2 died. I took the last one inside my house in a box , its warmer in here. She became more alive, and when beak dipped in water she would drink. When I gave her some food she barely ate a crumb. Her breathing got better but she still was only laying on her side (see pic). She doesn't sit or stand but only lays down. Her whole body is extremely weak. I woke up once at night to feed her and give her water. This morning she's even more weaker. She doesn't drink when her beak is dipped in water. She only moves her head from side to side. I lifted her head a bit by putting a smooth rock and an old rag under her head for support. This is the picture of her now. Any help is most appreciated. I don't know what else to do.