In addition to Lasiter's second place finish, Melissa Eldredge finished fourth for the Ironheads.
“It means so much because it's for our town,” Eldredge said of the state title.
White was Idabel's second straight individual champion. Madelyn Lehr captured the crown last year as a sophomore, but this year she was the team's No. 2 behind White, who also is a junior. Lehr finished eighth this year, 20 strokes behind her teammate.
White shot an 80 on Wednesday and an 83 in Thursday's brutal winterlike weather.
“I had a few bad holes so I really wouldn't be that proud of (Thursday's) round, but I definitely think it's a good score for the conditions,” she said.