Baby girl is so sick

[The Tiny Homestead]

Ive noticed she seemed a bit off. Still eating and hanging with her sisters. Ive been feeding her by hand to make sure she's getting food. She's got all her feathers her comb and wattle was my first indication something was off. Very pale pink. She's skin bones and feathers. Ive given antibiotics and electrolytes. She was outside walking around this AM but 2p she was laying in run eyes closed not moving. Then she made a sound. She's still alive and drinking water scarcely. Judging from her body mass I'd say parasite maybe as she was eating but obviously was getting zero nourishment. she won't make it i know just trying to love on her til the end. What could I have done better???
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I would just hold her in my arms and sing to her. My chickens like this modified version: You are my Sunshine My (insert their name, I'll use my Annalee's) Sunshine. You make me happy, when skies are rainy snowy, sunny or gray. You'll Always know dear, how much I love you. Your my Annalee Sunshine today.