Hi
You could start her on thawed out frozen peas and corn (not the canned processed stuff), and maybe some small raw peanuts (as they are easy to digest).
I'd say it is important to
first ensure she hasn't got dehydrated, just to be safe, so maybe you can help her with dipping her beak below the nostrils into a pot of water which has a pinch of salt and sugar (or better still glucose) mixed in - not good to feed a bird who may be dehydrated as the digestive system may not be functioning.
Your description sounds like it just could be the so-called 'one eyed cold',
but (unless you are certain that she hasn't been pecked) it could also be the result of trauma to the eye area. If you are pretty sure she hasn't been eating, it would sound to me more like an infection.
This post by our fellow-member 'Pidgey' a couple of years back gives the options suggested in a similar uncertain case which you may like to consider, bearing in mind we can't make a sight-unseen diagnosis:
A "one-eyed cold" is an old term for actually quite a few different things ranging from a bad one like Chlamydophila (Ornithosis; Psittacosis, Chlamydiosis) that require a tetracycline (preferably Doxycycline) to something a whole lot less bad like a Mycoplasma infection. Those don't usually cause primary illness other than the localized smaller problems like the conjunctivitis (tissue around the eye swollen and inflamed).
There could be an infection with a simpler bacteria that would respond to an ophthalmic ointment (topical antibiotic ointment like Terramycin or Neo-Poly-Bac that's especially for putting in eyes... usually available at a good pet store).
If you have a vet who sees your birds, I'd suggest getting her checked over to be sure.
John
