Okay, I'm not at all sure what you're dealing with, but there are a few things I want to address and this is what I'd do if she were mine.
She needs to be inside where it's warm, somewhere quiet and dark.
I would go get a big container of baby parrot food from the pet store.
You can mix that 1/2 powder to water, and give it with a syringe orally or even offer it in a little bowl- sometimes birds will eat it when they'll eat nothing else. It's high in protein and has all the vitamins and minerals included you'd supplement with, plus probiotics. Dehydration and malnourishment are obviously your worst enemies.
I'd get as much food and water into her as possible. I've had an avian vet teach me how to use a 'weak-kid' tube to inject baby parrot food gruel into the crop to ensure they stay fed. use a syringe and get her to eat some.
Get a B-vitamin complex and add it to her food or get a vet (or someone willing to inject, as you can get it from the feed store in injectable form) to give her a shot.
I'd try to find a homeopathic remedy for the symptoms- I just had the most miraculous cure on a chick EVER from a like-cures-like treatment. I used Hypericum Perf. 30x on a chick showing progressive paralysis from 3 weeks over 3 days. At the third day of symptoms she was unable to even lift her head and was on her side, frozen. She ate baby parrot food from a syringe.
I took the risk and ued 15 Hypericum tablets to 1oz of distilled water in a glass bottle with a glass dropper (metal kills the effects) and gave her as much as she would drink 3 times daily for 3 days. I waited. She got up! It was slow and very stilted, like cerebral palsey symptoms for the first 2 days, a limp the 3rd, and a week after it started, I can't tell she was ever sick.
It's worth a try to find a homeopathic practitioner who can advise.
Anyone??