The death toll from the weekend’s Texas freeway massacre has...

Friends of Texas mass shooting victim Leilah Hernandez said during a vigil Sunday night that the tragic death of the 15-year-old girl felt like the loss of a sister.

Yasmin Natera, 16, and Celeste Lujan, 15, carried a posterboard decorated with photos of Hernandez during the evening service in remembrance of the seven people killed in Saturday’s rampage at the University of Texas of the Permian Basin.

“[Leilah] was full of joy and happiness. Knows how to make someone’s bad day turn into a good day,” Natera told The Post. “She kept people out of trouble.”

The teenager was “more focused on school than boys,” her friends said.

On Saturday, Leilah and her 18-year-old brother, Nathan Hernandez, were picking up a truck he’d just bought from a dealership in the Odessa-Midland area when a gunman began shooting from a car.

Nathan wrapped his arms around his sister, and got hit by a bullet in his right arm, their grandmother Nora Leyva told the Washington Post.

Leilah was shot through her left shoulder near her collarbone, Leyva said.

Her last words were: “Help me, help me.”

In a tribute to his sister on Twitter, Nathan wrote: “I will always love you baby sis.”

“I wish [it] would of been me,” he wrote. “You still had your whole life ahead of you.”

The Odessa High School sophomore had just celebrated her quinceañera in May. Photos from the event show her looking regal in a bedazzled green gown.

She had been excited about starting catechism classes, her grandmother said.

Leilah also played basketball. Her classmates asked students to wear her number, 23, or green on Tuesday morning in her memory.

Natera and Lujan said they would be placing the poster they made in front of a tree near their school, where the three of them would usually meet before classes.

“She just wanted to help people out …,” Natera said of her friend. “It’s like losing a sister.”