The 14-year-old from Hesleden, County Durham, was among the favourites to win the $1m (£760,000) prize on Wednesday.
After the show, judge Simon Cowell alluded that he and Ketterer would work together in the future.
However, it was not enough to secure her the $1million (£760,785) prize, with magician Shin Lim crowned the victor. So will there be more collaborations between the two singers in the future?
She had reached the final through a string of impressive performances and during the first leg on Tuesday was described as a "superstar in the making" by judge Howie Mandel. "We are watching a superstar in the making right here on America's Got Talent".
OnePlus Announces Plans To Make TVs: OnePlus TVs Coming Soon?
This would allow the TV to showcase details such as calendar events, suggestions, and even booking a cap to and fro destination. This was confirmed by the company in a blogpost, through which it has announced its plans to create its first Smart TV .
Courtney was in the final pair alongside her fellow singer, Michael Ketterer.
America's Got Talent Season 13 was another great season full of talent.
Simon added: "I always say the most important part of being a star is being remembered and that's what you do".
She's had loads of support in the U.S. and back home in County Durham where she's from. You are going to tell a whole new generation of people what rock and roll is all about.
Coca-Cola in Talks to Make Marijuana-Infused Soft Drink
The beverage giant's interest is another indication of the growing acceptance of cannabis by established companies. Aurora Cannabis Inc. says it has not signed a deal with respect to any partnership with a drink company.
Courtney Hadwin with judge Howie Medal on America's Got Talent.
Cowell also said that even if she didn't win, he would sign her to a record deal, so this may not be the last the public hears from the teen.
Which is why Ketterer's mind-blowing follow-up on Wednesday, where he penned an unbelievable new song called "The Courage to Love", wowed the judges and earned a standing ovation from the audience.
Flood Waters Kill Two Horry County Detainees
The van couldn't be removed Tuesday night because of rising waters and unsafe conditions, according to the release. Holden says the deputies tried to get the mental health patients out but couldn't open the doors.