BRENTWOOD -- The driver killed after allegedly running a red light and crashing into a minivan on Saturday was a mother of two who worked in a family-owned restaurant, family members said Monday.

Authorities identified the woman Monday as 47-year-old Mary Hopper, of Valley Springs, a hamlet located at the intersection of State Route 12 and Route 26, east of Stockton. Her adult children said she was traveling to a family friend's funeral in San Francisco, but never made it. Hopper was airlifted to John Muir Medical Center in Walnut Creek, where she later died.

"She can't leave me," said daughter Katelynn Hopper-Campbell, 21. "She's all I have."

"It's been a rough couple of days," said son Hunter DeMattei-Hopper, 25. "You just never know."

A witness reported seeing a woman in a silver Dodge Charger, later identified as Hopper, run a red light while traveling west on Marsh Creek Road at Vasco Road, outside Brentwood city limits, according to the California Highway Patrol. A minivan traveling south from Highway 4 onto Vasco Road broadsided the Charger around 9:30 a.m., authorities said.

Hopper, the male driver and a pregnant woman in the minivan were airlifted to John Muir Medical Center in Walnut Creek. The condition of the other two adults -- as well as four children taken by ambulance to Children's Hospital Oakland -- was not released Monday afternoon.

Hopper's son described his mother as a "cautious" driver. She worked at the family's restaurant, Patti Campbell's Country Kitchen, in Valley Springs. Hopper is survived by her male partner of more than 20 years, her two children, two grandchildren and six sisters and one brother.

David DeBolt covers breaking news. Contact him at ddebolt@bayareanewsgroup.com. Follow him at Twitter.com/daviddebolt.