You should really get some sort of poultry vitamins. Electrolytes will provide a boost and help with dehydration, but she sounds sick enough that that most likely won't fix her. (recipe is 2 qt water, 1 tbsp sweetner (not molasses or artificial sugar), 1 pinch salt, 1 tsp baking soda.)
Can you provide a picture of her poop?
Is she warm enough? (sometimes, warming a chick up is all it takes)
Again, how old is she?
If you don't have any sort of poultry vitamins on hand, human vitamins will work. She should have b-complex (you can dissolve a tablet in a quart of water) 300 IU of E, and a little bit of selenium. Those are generally the main culprits.
Good luck with her and welcome to BYC.