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Bobbie, I'm sorry to hear of this with Marty. She's a bird that needs to be hospitalized under the care of an avian vet (please see here: www.aav.org). An avian-oriented vet might first treat symptomatically and supportively by providing supplemental fluids and electrolytes by needle and tube feeding a "recovery" food. Blood tests and cultures of Marty's choana - the slit between her oral cavity and nose - and cloaca (vent) may be taken. Whole body X-rays can be helpful as well.
Until Marty can be attended to, please heat up her environment to 85F by means of a 100W bulb shined into her partially covered cage (not at night when she needs to rest) or by taping a heating pad set on its lowest setting to the sides of her cage. Remove her perches and put her food and water on the bottom of the cage along with her.
Her polydipsia (increased thirst) suggests that she has become quite dehydrated losing fluids through her vomitus. She's quite geriatric and so disorders that cause polydipsia such as chronic hepatic and renal failure and diabetes mellitus are important differential diagnoses. Age-related malignancies (cancer) need to be considered as well. We can't medicate vomiting patients orally and so the vet will inject medications if need be. My hope is that once stabiized, Marty could then be medicated in a more conservative manner once home again.
Please respond with further questions or concerns if you wish.
My condolences for your loss of Marty Bird. I appreciate your taking the time to let me know. You may receive an inappropriate follow-up from the site ostensibly sent by me. It wasn't and I apologize in advance should you receive it.