Duck throwing up green stuff

[firenkyo]

Hi, apologies for another post but I just wanted another thread about her throwing up. My duck Daffy is very lethargic and when I checked on her just now she had green stains on her chest and some weird stuff that she had thrown up (I assume, I didn’t see it happen). She’s still not eating or drinking.
She is also shaking her head a bit as if she’s trying to get something out of her mouth.
I have some pictures here. The green string things were on her chest and nearby her

 

[Miss Cheep]

Hello! She probably ate something weird, so that could have caused the stains on her chest from throwing up. If she is shaking her head she probably still has some of the stuff stuck. To get her to drink you could put a cup of water in front of her and gently dip her beak in. It seems when I do this with my ducks they always drink. If she still has some of the weird stuff stuck that couId also be a reason she's not eating or drinking. don't know how to fix this, hopefully someone with more experience can help you.

 

[Marco duck]

Hello
My duck is sick throwing up ,donot know wt to do
He started shaking his head then spitting the water and food