• A Volkswagen SUV carrying six teens veered off the roadway and struck a tree near the shoulder in West Marin, Calif., on April 18, authorities said. Four died and two were injured
• In a letter to the community, the Tamalpais Union High School District confirmed that the six victims attended Archie Williams High School in San Anselmo
• “Our hearts are with the families of the four beautiful young souls, lost far too soon,” Jessica Glantz, the mother of crash survivor Marley Barclay, said

As a 14-year-old girl is recovering from injuries following a solo-vehicle crash in California last week that claimed the lives of four high schoolers, her family described what happened on that tragic night. 

“There’s been a lot of speculation about what caused the tragedy. We can tell you that there’s absolutely no evidence that any alcohol was involved,” 14-year-old Marley Barclay’s mother Jessica Glantz told ABC affiliate KGO on Monday, April 21.  

Barclay and Elsa Laremont Stranczek were the only two survivors of the early evening Friday, April 18. crash on San Geronimo Valley Road in West Marin.

According to the California Highway Patrol’s (CHP) Marin Office, a Volkswagen SUV veered off the roadway and struck a tree near the shoulder. Six juveniles between the ages of 14 and 16 occupied the vehicle, and all of them sustained major injuries, the department added.

“Three occupants were pronounced dead at the scene,” police said. “A fourth was pronounced deceased after being transported to a local hospital. The driver and another passenger were hospitalized in critical condition.”

In a Sunday, April 20, letter to the community that was later shared with PEOPLE, the Tamalpais Union High School District confirmed that the six victims attended Archie Williams High School in San Anselmo.

The four who died were 9th grader Olive Koren, and 10th graders Josalynn Osborn, Sienna Katz and Ada Kepley, read the district’s letter.

“Our hearts are with the families of the four beautiful young souls, lost far too soon,” Glantz said, per KGO. 

Glantz said that Barclay left home early evening Friday to meet up with her friends, including the driver of the vehicle, to go to Woodacre, the outlet further reported. 

Barclay told her mom that everyone in the vehicle was wearing seatbelts at the time.

“What Marley does remember, they were going around a blind turn and another car veered into their lane,” Glantz said, per KGO. 

Glantz said that Barclay has a “long painful road of recovery” ahead. 

A Sunday update from a GoFundMe established for Barclay and her family read: “Words fail in times like these, and nothing can adequately express the deep sorrow we all feel for the families of the deceased. Marley is devastated. We know she, the families of all involved, and the wider community will be reeling from this tragedy for quite some time.”

PEOPLE contacted the CHP for additional information on Tuesday, April 22. 

In Tamalpais Union High School District’s statement, superintendent Tara Taupier wrote in part: “Words cannot fully express the sorrow we feel. Our hearts are with their families, friends, classmates, and the entire Archie Williams community as we grieve together.”

Janet Upton, Kepley’s aunt, emailed a statement to PEOPLE on behalf of the family about their loved one on Monday, April 21. 

“Ada was a kind soul and gifted artist with an irreverent sense of humor that made people feel joyful and included. She adored her big brother, Dylan, spending time with close friends, and being with her large and loving family,” read the family’s statement. 

“Ada’s absence leaves an unfathomable hole in our lives. We are grateful for our friends and community, and are also grieving the loss of so many beautiful souls whose lives were cut short,” it continued.  

Never miss a story — sign up for PEOPLE’s free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer​​, from celebrity news to compelling human interest stories.  

“To Ada’s friends, thank you for bringing  her joy and for lifting and embracing her unique spirit. Knowing she had you in her life brings us great comfort,” the family said. 

“We would like to thank the firefighters, law enforcement officers and all those who participated in the efforts to try to save our Ada and her friends. Your personal sacrifices in the wake of this tragedy continue to hold a place in our hearts,” the statement concluded.

A number of GoFundMe online fundraisers have been created for Kepley, Koren, Osborn and Katz.