Mary is playing with her infant daughter Rosalie. Mary responds to Rosalie's facial expressions by mimicking and exaggerating the same expressions. All of a sudden, Mary's face becomes blank and she does not show any emotion. How is Rose likely to respond?

She will, as well, not show any emotion.

Explanation:

Rose is trying to copy her mother's expressions and exaggerating them; but now that Mary doesn't show any emotion, Rose won't do it either. She cannot exaggerate anything, as there is nothing to copy, if mom had at least opened her eyes a bit wider with still no emotion on her face, Rose could've probably opened her eyes even wider showing an exaggeration on her mom's expression.