It's a bit of a cheat, but tonight is the first time Emily actually dropped one into the loo proper.
She was bent over, as we all do sometimes, with a manic pushing look on her face. A quick check led to the affirmative that the turtle was trying to escape. As quick as you like, we ran up to the loo, dropped trou and proceeded... to wait.
A few songs later, I could see the little chocolate Hershey kiss (I KNEW there was a reason I didn't eat them!) dangling quite resolutely between cheeks and loo. A quick "shake" and the American chocolate's namesake was right where the American chocolate deserved to be.
I don't know what Emily got out of the first "I've done a poo on an actual toilet" moment. I fear not much. I praised her, like you do, but I think it's going to take a few more attempts to get her to really understand that what she did should be the norm, and taking a dump in a nappy should be the exception.