Trick 1 of 12 is complete!
Okay, so maybe I cheated a little on this one, as I didn't start it from scratch. We actually started working on this trick years ago- 2009, maybe even 2008- but I never got around to putting it on cue (story of my life). As a result, it's a trick that she offers up on a regular basis, so it was pretty easy capture it. Once she knew that's what I wanted, she kept offering it, and offering it, and offering it, so it was pretty easy to give the cue just before she did it.
We did this for several nights, probably burning through 200 or more pairings, and still she didn't seem to understand. Looking at the video, I would guess that part of the problem is that I have two things going on at once- the hand signal and the verbal. I'll need to make sure to sort those out separately.
She seems to have it now. I've tested the cue "cold" (that is, giving it outside of a training session) in every room of the house, on a walk, and in the parking lot of a pet store today. She nailed it on the first try every time. However, in the manner of herding breeds everywhere, if I give the cue more than 2 or 3 times, she starts... well, let's say improvising. That sounds so much nicer than "doing it wrong."