Her friends called her sweetpea and goober. A countdown clock on her MySpace.com site still ticks away the seconds, minutes, hours and days to what would have been graduation day for Andrea Hartman.

But Tuesday, grieving classmates at Alta Loma High School wore red to honor Andrea, who died Sunday when the Sea-Doo she was riding collided with a speedboat on the Colorado River.

Red was Andrea's favorite color, and the 17-year-old was one of Alta Loma's most popular students, said Principal Bill Bertrand.

She made the varsity dance team as a freshman, which Bertrand called rare and a testament to her talent. He said she had been accepted to Cal State Fullerton.

Now, classmates and faculty are trying to make some sense of an afternoon of fun that ended so terribly.

"She had many, many loyal classmates and friends," Bertrand said. "There is lots of grieving, lots of sorrow."

The Alta Loma teen was riding a 2002 Sea-Doo when she turned into the path of a 21-foot Warlock speedboat near Circle Beach Sunday at 4:57 p.m., said San Bernardino County Sheriff's Sgt. Tim Smith.

Smith said the boat driven by Jerry Posey, 52, of Cherry Valley, struck Andrea, who suffered massive trauma and was pronounced dead at the scene.

Smith said the boat and the Sea-Doo were traveling about 20 to 25 mph at the time of the collision. He said alcohol does not appear to be a factor in the crash, which is under investigation.

Classmates posted a photo of Andrea on the school's Web site under the words, "You will forever be in our hearts." The school brought in the district's crisis team, and Bertrand said local pastors came to Alta Loma to offer their support.

"It's a tough situation," he said. "She was a fine young lady and a very good student."

He said the school is giving students time to grieve.

"We're more or less giving students time to spend the day just expressing memories, love and caring," he said.

Sophomore Anna Richardson knew Andrea from a student-leadership class.

"She always had a smile on her face," she said. "She was always laughing, gorgeous."