Mayberry finished with 22 points in helping the Hornets to their third title in school history.
Taleya was instrumental in the other two, in 2008 and 2009.
Devers, who was the star of the Spartans' semifinal win over Tulsa Union, got in foul trouble early and never really recovered.
She finished with 10 points and fouled out with just more than a minute remaining.
Stevi Parker, who also battled foul trouble early, never picked up her third foul and finished with 13 points to lead Bixby (21-8).
The Hornets came back to win this one after missing the tournament last year for the first time in more than a decade.
“I told them I made some mistakes last year, and it wasn't going to happen again,” Kennedy said. “I was going to be tougher on them and demand more. They were ready to clean the slate. They left last year with a bad taste in their mouths.
“I'm so grateful that I had the character-type of players to be able to handle that.”
The change started in the summer and carried over to the season, Kennedy said.
“We were just focused on a state championship,” Mayberry said. “That's what she always talked to us about and now we've got it.”