8-month old female Blue Crowned conure sick...high liver enzymes

She has been at the avian vet in an incubator for 2 weeks now. Reason for 3rd visit was she was not gaining weight and despite a great appetite failed to gain weight. Displayed episodes of leaning against cage, losing balance and eventually falling off of perch. Never lost consciousness and got right back up on her perch.

First CBC showed high wbc (46,000) and liver enzymes (784). Tested negative for viruses and metals. She was given two antibiotics for the possible bacterial infection. She is on dr. harveys food, pellets, vegs & fruits with a great appetite. After two weeks, wbc dropped to 24,000 and liver enzymes down to 352. I am picking her up tomorrow (:)) and she will have her CBC rechecked in 3 months. Vet is not as concerned about the WBC and says they will continue to go down but he said there is a possibility of liver damage due to her malnutrition (purchased her at a pet store unaware of her being underweight of the time) that could be fighting against us. Any advice or recommendations for food or her tests results I have been given. I do not want her to suffer. Thanks Brenda