Dog chased us?

There is a lady my friend and I see every time we get ice cream at a restaurant in town. She owns an antique next to the ice cream place. The lady is crazier than a pet coon! I can't even explain her! She let her chiwowa off the leash, and it chased us all over the parking lot. He was barking like he was rabid. It was really embarring because we were screaming, and running in front of everyone. What should we do?