thank you notes

I made Abby write a thank you note to her teacher, then she caught the bug and wanted to write thank you notes to all her friends. She also wrote one to Sam, and to her Dad. She then said to me, "I want to write you a thank you note, but I don't know what for..."

Is that when I laugh or cry?

(I've chosen fatigue/fighting bitterness. Are you for real? You can't think of anything to thank me for? And trying not to read anything into it past a seven-year old.)