Parents and students at La Reina High School and Middle School received an email Thursday night with the news that 14-year-old Gabriella Chabot died.
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La Reina is a Catholic all-girls school. Officials said there were counselors on campus Friday.
The school said classes also operated on a normal schedule and there was a prayer vigil at 6 p.m. at the campus gym.
Gabriella's father, Michael Chabot, said his daughter was an amazing and beautiful girl who would have turned 15 on Feb. 16.
"Today I experienced the day that no parent should. I lost my daughter," he wrote on Facebook. "Papi will never forget you. You will always be my angel."
The school released a statement, saying Gabriella was a "bright, engaging and kind girl who will be deeply missed by her friends, faculty and staff."
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As of Tuesday, there have been 37 confirmed flu-related deaths this season, with most people being over the age of 65, according to Ventura County Health. It's been the deadliest flu season in the County since 2009.
A report released Friday by the Centers of Disease Control and Prevention stated that one out of every 13 visits to the doctor last week were because of flu-related symptoms.