My Pekin duck is not eating!!

[mamaduck67]

I have a 1 1/2 y.o. female pekin duck. She has recently stopped laying eggs and has not eaten in 4 or 5 days. She is drinking plenty of water, however. She won't even eat her favorite treat, lettuce. I have tried giving her meal worms, hard boiled eggs, cracked corn mixture, and her usual pellet food. She is laying down a lot and not very active. Her poop is green/yellow and watery. I gave her some molasses water, as I read to do online to help flush out toxins, but I see no improvement.

Please help me with any ideas you may have! Thank you in advance!