I was on the way home from Costco with my family in her minivan

I'm looking back in a mirror and see a red cavalier (I think?) on the fast lane try to stay in lane. She was waving in and out. So I watch my back does not want any accident. The old one on the rear bumper did not get fix yet.
She run right in to the wall with her left side. She smack it real good and still keep going. Just before Virginia exit around In&Out she cut across all the way to the left. I think she gonna get off the 395 but nope she did not get off but cut all the way back to the right lane again. Then she smack the wall again.
I slow down to see the driver but stay wayyy to the left. It's female driver and she look awake. She continue waving. I call Hwy patrol, they said someone already report and follow her now.
She got to be on drug....