Victoria Hernandez was shot and taken to the hospital on Sunday.
The San Bernardino County Sheriff's Department said it all started with several kids fighting around 6 p.m.
The violence escalated into gunfire near the Cinemark movie theater. The mall had to be evacuated. Photos from the scene show doors with broken glass at the theater.
It's was not immediately clear what led to the fight and no arrests have been made.
Hernandez's family launched a GoFundMe page to help with her recovery efforts.