I'm afraid that looks like Marek's disease to me. The best you can do is keep her warm and as comfortable as possible and encourage her to take a vitamin supplement and eat an egg or if she is unable/unwilling to eat even with your assistance then it would be kinder to euthanize her as she looks extremely sick.
You might want to consider having a necropsy done if she does die. Some state facilities provide a subsidised service which makes it worth while using. There are lists of state facilities for such here on BYC if that is a route you might want to take.
I'm sorry I can't offer much hope for her. I know how hard it is to care for very sick birds and to make and carry out those difficult end decisions.
I don't think dear its Marek's some vitamin deficiency mimic like Marek's. Marek's first symptom is paralyzed wing or leg ..curled toes are vitamin deficiency ...