Search For Hit & Run Driver of Grey Mercedes SUV

A woman (late 50's, Caucasian) driving a Mercedes Grey SUV rear-ended a Ford Expedition that was at a full-stop at the traffic light at the northbound intersection of Veronica Springs and Las Positas around 4pm on Sunday, 2/24/19.  The driver of the Mercedes SUV fled the scene, after being asked by the victim to pull to a safe place to exchange information.   Because of the heavy traffic, the victim did not have a chance to get a photo of the Mercedes (and assumed that the perpetrator would not flee the scene).  The victim also was transporting a minor child.  The Mercedes SUV has extensive front end damage.  
Please report if you see this SUV.  Thank you!