electrolytes are easy to make:
1tbs organic cane sugar/ raw honey
1/8 tsp sea salt
1/8 tsp baking soda
stir into 8 oz of filtered water
it will help but it will not save a sick chicken. unfortunately chickens are weak and can die any moment. my big fat naked neck girl went to lay an egg and...
sorry for your loss.
I think she waited for you to leave and died in peace. if there was no blood she died naturally. a month is a long time to bond.
you are not the only sentimental one here and I don't think you will change. nothing wrong about that.
I had a lakenvelder hen like that. I let her die naturally but she never looked like suffering a lot. she laid soft shelled eggs from time to time. if she had been suffering a lot I believe I'd put her down. so, watch your girl and make your decision.
p.s.
I have an araucana hen who was in...