The 20-year-old only managed an even-par 72 in the fifth and final round of Q School to finish at 17-under-par 343. That was good for a 12-shot win, the largest margin of victory since the tournament began in 1973.
Libby Smith (69) and Lee Ann Walker-Cooper (71) tied for second place at 5- under-par 355. Brooke Tull (71) and Katie Futcher (73) shared fourth at minus- 4.
Morgan Pressel, who won this year's U.S. Women's Amateur Championship and finished second at the U.S. Women's Open, earned her tour card on Sunday. She shot a 2-under 70 and tied for sixth place with Julieta Granada (70) and Kate Golden (74) at 3-under-par 357.
Unfortunately for Pressel, she won't be able to use her new status until May. The LPGA Tour has a rule that members must be 18 years of age, and Pressel doesn't turn 18 until May. She is expected to appeal the ruling once more.
The top-24 players earned exempt status on the LPGA Tour next year.
Seven players engaged in a playoff for the final three exempt spots. Brittany Lang, who shared runner-up honors with Pressel at the U.S. Women's Open, captured one of those spots along with Seol-An Jeon and Christi Cano.