Cognitive issues that have lasted two years rules out anything acute and points to something chronic, it could be old age related diseases, but for all we know she may not be that old and this could be something else. The bleeding is concerning, I can’t say it’s linked to whatever she has going on or if she hurt herself somehow.
Green watery droppings generally aren’t good but if she’s eating a lot of greens and water it can be normal so sometimes with waterfowl it’s hard to say, with most birds if it’s different enough that you’ve noticed that it’s different than it’s probably not good.
Droppings can be hard to read but from what I know if the urates “the white or off white part at the end of a log dropping or the white stringy part in a puddle dropping” is bright green or yellow it indicates kidney or liver failure. If it’s really bubbly it can mean that she has a bacterial infection, black or red can mean coccidia in the lower or upper digestive tract or internal bleeding, undigested food can mean parasites, heat stress, or organ problems.
One concern is that she could have lead or zinc poisoning, which can cause confusion, but she wouldn’t have lasted two years with it so it could be that she happend to have one issue going on and ate something she wasn’t supposed to on top of it?
Another concern would be parrot fever which is contagious, most birds tend to have respiratory issues I’ve heard when they have it but a few don’t, it’s contageous so she could have gotten it from a wild bird and it could be passed among the flock.
A vet can diagnose it or whatever else could be causing her illness. If it’s comething contageous I’d want to make sure it’s diagnosed and treated, if it’s poisoning it can be treated depending on how much of whatever it is she can pass out of her system.
If it isn’t those then all of her symptoms, minus the bleeding could point to her liver and kidneys not functioning normally, unfortunately there isn’t always a way to reverse problems like these. If she hasn’t developed ascites then there’s a chance the liver still has the capacity to repair itself, but it isn’t a guarantee, you could try giving her lily of the desert aloe detox, denamarin in the small dog dosage, tart cherry extract, fresh lemon or grapefruit juice in her water, as many fresh greens as she will eat, antioxidant rich foods like blueberries, if she rebounds that would be great but at the least they might give her a bit more time and make her more comfortable.
These are just some ideas, her symptoms are pretty serious and honestly a vet would have a much better idea of what she might be dealing with and how to treat it if it’s treatable, though I know that isn’t alway an option for most of us even without current world issues so it’s undestandable if it’s not an option.
It’s good that she’s somewhere warm with a friend, you were right to make her more comfortable, that’s the most important thing and hopefully I’m just over thinking things and jumping to worst case senarios and she bounces back on her own. I hope she feels better soon.