I think I'd be inclined to respond the same way.I wouldn't walk through her door again if she were the only vet in 100 miles, and I'd make sure all my friends knew about the way you were treated there. I imagine your state's veterinary board would be interested in hearing about it, as well, and the local paper.
It turns out that yesterday's white egg wasn't the first one. It was just the first one I found. There's a shelf that takes up the back wall of the coop that's been there longer than chickens or ducks have been. I found them on the shelf after I spotted one of them. 