The family of one of the victims of a deadly train accident in Marysville told KCRA 3 on Saturday that the 16-year-old girl is fighting for her life.Watch report: Sister of victim hit by train in Marysville speaks outFamily members of Mickayla Friend said she is in critical condition at Sutter Roseville Medical Center after being hit by a train around 7 p.m. on Friday as she and her boyfriend walked along the train tracks.The teenage boy Friend was with was killed in the incident. Law enforcement officials have not confirmed either victim's identity."You can't imagine getting the worst call in your life, knowing that you just dropped your sister off to go to a dance that was supposed to be a special, amazing night for her and her boyfriend of a year," said Friend's sister, Alithya. "And then you get a call that says he's deceased and she's in critical condition."Friend's sister said the young couple had planned to take a short walk to the Dollar Tree to buy some food, then head over to the Sadie Hawkins dance at Marysville Charter Academy for the Arts, on B Street, where she said both students were attending school.People taking in a baseball game near the tracks watched helplessly as the train approached the pair."The engineer was on the horn," said Sean Stark, who saw the incident happen. "Then finally, they both looked back at the same time."Stark said the teenage boy made a split second decision."They would have both been underneath that train if he didn't push her out of the way at the last second," said Stark."It's her first boyfriend, and her first love," Alithya Friend said. "And she just got it taken away from her in an instant."Union Pacific is investigating the accident with the help of the Marysville Police Department.Investigators told KCRA 3 the teens were walking southbound on the train tracks, and the train was also traveling south.The train horn sounded and the emergency braking system was initiated, but it was unable to stop before striking both teens, officials said.