What do her poops look like? Poultry NutriDrench from you feed store would be even better than electrolytes, and dosage is 2 ml daily by mouth. Can you look her over for tiny bugs (mites or lice) under her vent, belly, and elsewhere on the skin? Offer some plian water, a few bits of scrambled eeg or tuna, and wet chicken feed. Is her tail held up or down? Her wings look a bit low, so I would try to get her drinking.
Check her crop to see if it is empty or full, hard or puffy. Was she ever vaccinated for anything?