My Mother-in-Law Brought 38 Friends to My Restaurant and Ordered $23,289 of Food—She Stopped Smiling When I Put the Folder Beside Her Bill

Yes.

Almost certainly.

“Then why serve her?”

That answer changed over time.

At first:

To teach her a lesson.

Later:

Because I needed the situation documented clearly enough that there could be no debate about what she expected from me.