"My mom came in and she's like, 'You're going on "America's Got Talent"' and I was like, 'Wait, what?!" the 13-year-old said.
Moakler got the news after the recording studio that gives her voice lessons, Bristol Studio in Boston, sent in a video of her singing to producers.
The producers saw it, liked it and sent her a pass to get her to the front of the line at an audition Saturday at the Rhode Island Convention Center in Providence, where she will sing for another set of producers.
"I'm super excited. This is like a big thing for me, so this could be the start of something new," Moakler said.
Her talent is something her mom saw in her at a very young age.
"When Sara began singing, we just realized it was a God-given talent and it wasn't something we should waste," said Jacque Moakler-Wendel, Sara's mother.
Moakler's rendition of the Bruno Mars song, "Locked Out of Heaven" is great, and so is her maturity. She excels on stage and in the classroom.
"Education is the most important thing. If I didn't have singing, what else am I going to fall back on? Education is the main thing," she said.
"Right now it's about having fun and enjoying being 13 and not putting pressure on yourself that you have to do well," Moakler-Wendel said.
Moakler said she'll be sure to do that no matter what happens at the audition.
"I like performing. I want to show them what I can do and I want to make people happy through my voice," she said.