Playground Ethics

Here's the scenario:
A mother walks into a playground with three children. The two older ones, around ages 6 and 8, run to play in the older play area, leaving mother and one year old in the younger play area. Mother sits on the bench and the one year old begins to whine and struggle to get out of the stroller. Mother tells the child to stop, and pushes the child back into the seat several times. Child relents, but still whines and cries.

What do you do?

This really happened today, and I'd love to see people's responses.