If she's been on the ground for awhile and not been wormed I would worm her with Safguard liquid goat wormer. It is pretty safe stuff, and kills a lot of worms. While treating up her protein level, give her warm mushy canned dog food or scrambled eggs. If she will not eat you will have to put it in her beak. Also put some vitamins in her water... some stated above. Separate her and keep her warm. Check her for lice/mites especially around her vent area as these can suck blood out of them and make them very weak. Check between her stomach and vent with your hand, firm but easy, for anything that feels like a hard egg. More than likely if she went from being in a cage to being on the ground, her insides have a weaker tolerance for parasites than those that grew up on it. I'd check for an egg, worm, then if no improvement, I'd treat for cocidiousis, then if no improvement..... look for other symptoms. Best Wishes