Except she never said goodbye.
"We were going to go look for her," said Kami Baker, 16, a junior at the school.
The next day, Baker learned the ugly truth about what had happened to her friend.
She had been gang raped and beaten for almost two-and-a-half hours and left unconscious under a bench shortly before midnight Saturday night.
"I busted up crying," Baker said.
The campus incident in the Bay Area city north of Oakland has shaken students and their families. Baker was one of many people connected to the school and the community who lashed out at officials at a public safety hearing Wednesday.
Baker blamed school district officials for not doing enough to protect her school -- and her friend. She said none of the four officers who were at the homecoming dance was patrolling the school premises even though there were a dozen young men hanging out just a few feet from the gym entrance. She says school officials chose not to take any action.
"I looked outside of the gym and I saw 12 to 15 guys, sitting there, with no IDs," Baker said at the hearing. "The officers -- not only did they not check the IDs of those students or men sitting outside of of our campus, but the security officers who are employed here did no ... checking either. The assistant principal looked outside and actually saw those men, and did nothing about it."
Baker took the podium with her younger sister, Barbie, a freshman at the school, who had spent a chunk of Saturday evening with the rape victim.
"This story has disrupted the school's morale greatly, including my own. I am friends with the girl," Baker said. "When I started here, I felt extremely unsafe and so did she, due to the lack of police officers and security officers."
Baker later described the 15-year-old girl as a churchgoer who struggled to fit in at Richmond High.
Police investigating the rape have arrested five people -- two adults and three minors, who will be charged as adults, said Lt. Mark Gagan, the Richmond police spokesman.
As many as 10 people were involved in the assault in a dimly lighted back alley at the school, police have said. Another 10 people watched, without calling 911.
The victim was released from hospital Wednesday, Gagan said.
Baker took heart in her friend's progress as she recalled how a night of joy for carefree teenagers turned into one that no one wants to remember.
