FALL RIVER — About 40 high school students gathered Saturday at the Boys & Girls Club of Fall River to mourn a friend whose life of promise was cut short in a rollover crash just as she was driving to her senior prom.

They laid flowers for her at the flagpole, and wrote colorful messages on white poster boards that spoke of her smile and how she could “light up a room.’’ They also created a memorial that read, “We (heart) you, Ropo.’’

Hannah Raposo, 18, was driving south on Route 24 to B.M.C. Durfee High School’s prom at White’s of Westport on Friday evening when she lost control of her 2003 Ford Explorer Sport Trac, according to State Police and the Bristol district attorney’s office.

She was ejected from the vehicle and pronounced dead at Rhode Island Hospital in Providence.

The other passenger in her car, a boy who was going with her to the prom, was reported in stable condition after suffering injuries. Authorities had no further information Saturday.

At the prom Friday night, it was “very emotional,’’ said Colin Meserios, an 18-year-old senior.

Raposo, who was set to graduate this week, recently won the Youth of the Year award from the Boys & Girls Club. On Saturday, it became a place for teens to come together, cope, and keep the memory of their friend alive.

Raposo had a bright future ahead of her, said the club’s executive director, Peter McCarthy.

She had been part of the club for 11 years, he said, and was named president of the Keystone Club, a national leadership group, in addition to Youth of the Year, which granted her a $2,000 scholarship award.

“She was a role model here at the Boys & Girls Club, for younger kids, and the older ones,’’ McCarthy said.

McCarthy said Raposo was “an amazing artist’’ and planned to use the scholarship money from her Youth of the Year award to study art and biology at Bristol Community College. “She did everything right,’’ he said.

“I took her to City Council last week to be recognized,’’ McCarthy said. On Sunday, she was supposed to meet other students who were named Youth of the Year at Westfield State University.

“We had all this stuff set up for her to do,’’ McCarthy said. “It’s just heartbreaking thing after heartbreaking thing.’’

McCarthy said he was proud of the staff and the students for creating the memorial for Raposo at the Boys & Girls Club.

“Now it’s trying not only to cope, but to find a way to keep her memory alive,’’ he said.

Raposo designed her name on her locker at the club, he said, and right there with her name were the words “Live Forever.’’

“My team director was like, ‘that’s staying there forever,’’’ McCarthy said.

Alexandra Koktsidis can be reached at alexandra-.koktsidis@globe.com.