help chicken seems sick..
Welcome to BYC. What symptoms or illness did your other chickens die of? Can you bring her inside for warmth, and to watch her closely? Give her electrolytes in her water (Gatorade or Pedialyte will work in a pinch,) feed her some egg or chopped tuna in addition to her usual feed. Watch her droppings. Feel of her crop to see if it is full, hard, soft or empty. Feel of her breast bone to feel for any loss of weight. Look her skin over for any signs of tiny bugs (lice or mites,) or their eggs. Worms cannot always be seen in the droppings. Valbazen and fenbendazole (SafeGuard or Panacur) are good wormers.