The Cookout Scene

During the cookout scene, when Roger is at the grill, it looks like the grill lid falls on his daughters hand.
He asks if she is okay, as she is seen shaking her hand.
I'm wondering if this was scripted, or if it was an accident that was left in the film.
If it wasn't scripted, has it been mentioned anywhere if the girl was hurt or burned in someway, in that scene.
It looked to me that she either got her fingers pinched, or maybe burned her hand.
Any thoughts???