The event, held at the Venetian Hotel in Las Vegas, Nevada, was hosted by former Miss USA Olivia and Vine star Cody Johns and live streamed on the organization's website.
Hay performed well in all aspects of the competition, including personality, evening wear and activewear.
The recent Tomball High School graduate also stunned in a floor-length yellow gown, reminiscent of Belle from Beauty and the Beast.
This was the first year the competition included an activewear portion, replacing the former swimsuit competition. The contestants wore Tapout X Goldsheep Activewear, the official training apparel of the WWE.
In addition to Hay's win, Miss Alabama Erin Snow was crowned photogenic winner, and Miss Rhode Island Malia Cruz won Miss Congeniality.
Total Divas star Eva Marie was on the competition's judging panel, along with former Miss Teen USA Hilary Cruz, Style Studio founder Keylee Sanders, former Miss USA Lu Parker and musician Savannah Keyes.