Try the egg yolk first. That will be more nutritious. If she won't eat that, then give her what she will eat, especially if she's losing weight.
Are there any other symptoms?
@007Sean
Watery or green poop comes from not eating.
It sounds like something else at this point. If she were egg bound, she wouldn't be pooping at all.
Is she getting enough calcium? If she isn't already separated from the other birds, then separate her right away. I don't normally recommend treats, but will Ashe eat any? Try feeding her...