Thanks for the reply! I went to try this earlier and it led to... well, something of an adventure. Those of you grossed out by poop, stop reading now. (I know there are so many people like that on this thread. )
I had Wibbles out on some paper towels with her little dish to wash in, and she was flat out not interested. I splashed the water, I dropped it on her beak, I even tried to dunk her beak in it. Nothing. So we were going on with this struggle when I saw her do the poop motion, wings in the air and everything, but nothing came out. Uh-oh! I checked her out and she had a poopy butt, so instead of having her play in the water, I ended up using it to clean her butt off. After struggling with it for a while (is duck poop waterproof or something?!), to Wibbles' loud protest I might add, I decided I had to take drastic measures and clipped her rear clean. And then she let loose.
Right. On. My. Hand.
The good news is, she's all clear now and pooping everywhere (she was before, no worries there--she just was blocked for a few hours as far as I know!). The bad news is, she never got to try washing her head in the water. Oh well, we'll try again tomorrow.
I'm glad you caught the poop blocking her vent in time, but about your hand... . Hmm... strange she didn't take right to the water. I wonder if it's because she just a few days old is the reason why she isn't too interested in it. Anyways, I wish you good luck with your little duckling