Thanks for the suggestion.when you're stuck like that, the best thing is to start the process all over again: raise her motivation for one week cycle, then revert
I actually tried doing all my chores instead of blowing them off. Chloe then wound up being punished on 2 separate evenings, and the Sunday monring event finally happened.
Previously, Chloe was only being spanked once every week (Friday or Saturday dinner). I don't know if not being punished myself was the key, but at any rate my problem is now solved,