I really feel like she learned a lesson out there. For the most part she seemed to enjoy the work, and we only heard the occasional "I'm tired" and "I can't" from her. Eventually she took a potty break, and when I went to check on her, she asked if she could please eat her dinner.
I of course let her eat more of her dinner, which we had left sitting on the table. It was hot outside, she expended a lot of energy working, and she was aware that her body needed the fuel. She only took a few bites, and then she was back out finishing the work with King Dad.
Since this little experiment I haven't had near the same amount of tantrums over food. I push her less to eat, and she eats more willingly.
Of course while she was hard at work, her sisters were right next to her having fun
And Prince L just hung out with us
With how well this consequence cworked out, I think it's one we'll be using more frequently