Told you I'd check in!
Yesterday didn't go quite as smoothly as I had hoped, but I think Anna still made good progress. Toward the end of the day she tired of our games and wanted to play with her cousins.
Now, my plan is to continue doing rehearsals several times a day, spend as much time in panties as possible, and of course--lay on the praise for successes. I am still hopeful she will figure it out very quickly. It's partially a matter of breaking a 2 year habit of going whenever/wherever.
Go Go Anna! You can do it! (Go Go Lisa, you can survive it!)