Non alcoholic fatty liver in humans, can be a side effect of an injury but is more likely genetic.
I don't think you harmed her. What do you feed, protein % ? What does he mean by high energy diet? Yes, 25% fat would be too much if that was the total intake. But if you keep your treats to less than 10% of their total ration, then it should be fine.
Yes I think you should call and see if they did get it right and ask why they didn't put any detail to breed and such including weight.
And I'm really not diggin' your vet!
Would be looking for me another. It's one thing to say he's no avian expert. But to charge to have a report faxed to his office?! That's some greed IMO, and would take my business elsewhere.
The good news is that isn't contagious to the rest of your flock.
I suggest that you leave your birds be... Throwing a liver cleanse and all kinds of other things people might do, doesn't make it right or beneficial. Especially if you try to many things all at once, you won't even know if it made it better or worse, what worked or didn't.
Sometimes the best thing to do is keep it simple! Fresh plain water. Make sure they have a balanced feed (usually commercial) and not more than 10% treats. I recommend a flock raiser or all flock with about 20% protein and 1% calcium for a mixed gender and age flock, with oyster shell on the side. I use Purina Flock Raiser, because that is what's available that meets my needs affordably.
Layer feed only has 16% protein and 4% calcium, which is too high if calcium for birds not in lay including chicks, roosters, and molting hens. And the lower protein is the bare minimum to support egg laying but not necessarily hatch healthy chicks. The extra protein also helps feathers grow in because that is what they are made of. I only mention it because many who have roos & older hens don't realize they calcium in layer can cause kidney damage when fed long term.
I am sure head is spinning still. Hang in there. How many friends did Pinkie Lee have living with her?