After finishing high school, she auditioned for the reality talent show The Voice of Germany. During the live broadcasts, Quainoo was the only participant of the series to be voted in every time by the spectators. During the finals show on February 10, 2012, she received 33.65% of the combined votes, based on telephone voting and the number of song downloads, with which she left the other three final candidates behind
After the final show, she promoted her single "Do You Like What You See?" on the Harald Schmidt Show and on Verstehen Sie Spaß?. Her first album, entitled Ivy, was released in March 2012. At the Echo award ceremony she sang, together with Aura Dione, Caro Emerald, Ina Müller and Dionne Bromfield, the song "Valerie" in memory of Amy Winehouse. Furthermore, Quainoo presented her second single "You Got Me" on ProSieben Celebrity Boxing. On 14 May 2012, she started her first tour of Germany with a concert in Lüneburg. On the final show of Germany's Next Topmodel Quainoo sang her single "Break Away". In October 2012, Quainoo worked with Mousse T. on a song for the movie Man tut was Mann kann. She also recorded the Song "Who You Are" with Stanfour for the mini-series World Without End. On November 16, she released her album Ivy as a Gold Edition in which these new songs are available.
Quainoo has been working on her second studio album in New York City, London & Los Angeles. In June, Quainoo stated that the album is finished and will be published in fall 2013. The album called Wildfires which was revealed some days later.[11] On 6 September 2013, the first single "Wildfires (Light it Up)" from her second studio album was released. To promote the single and the album Wildfires, Quainoo performed at Schlag den Raab, Promi Big Brother and also having several radio interviews round the release dates. The album Wildfires was released on 27 September 2013. In October Quainoo is a special guest on Olly Murs Germany tour dates. Her next solo tour started in January 2014 and was called Wildfires Live Tour.