Jennifer Balon's Facebook page reflects her love for her children, with photo after photo of them playing, laughing and hugging.
On Tuesday, condolences from around the world poured in.
"Jen, things will never be the same again. We are so devastated that we lost you this soon," wrote her friend Willen Berdos, also an East Bay nurse.
Three survivors hospitalized were identified as Jasmine Desguia, 34, of San Jose; Mary Guardiano, 42, of Alameda; and Amalia Loyola, 48, of San Leandro. Nelia Arellano, 36, of Oakland, was treated and released.
The survivors managed to squeeze through the partition after the driver pulled over and climbed out. The victims were found pressed up against the partition.
Several of Fruitvale's chief staffers paid a somber visit Tuesday to the home of one of the surviving passengers, Nelia Arellano. Arellano and her visitors declined to speak after their meeting.
Mourning was not limited Tuesday to those who knew the victims.
"In our hospital, we didn't know these women, but all of us Filipino nurses who work together are very affected by this," Amy Johnson of San Jose said. "It touches all of us very much. Someone lost a mother, a sister, a daughter, that affects everybody."
The Associated Press News Information Research Center and writers Sudhin Thanawala and Garance Burke in San Francisco and Gosia Wozniacka in Fresno contributed to this report.