Describe how Grandma got her comeuppance on snooty Mrs. Weidenbach?

From the text:

“And another thing. I’ve got a confession to make,” I said. “I know you wanted first prize on the pie. You wanted it bad. And I thought you’d switched the card on Mr. Pennypacker’s pie with yours so you could win with his pie.”

She shot me her sternest look. But then easing back in the platform rocker, she said, “I did.”

Grandma got her comeuppance by actually winning the pie contest..... even though nobody knew it. The blue ribbon on her bonnnet allowed her the victory flight in the plane.