Through televoting, the audience chose Heinzmann as the winner of the show, beating the two remaining contestants, Steffi List and Gregor Meyle.

[9] Her first album, Masterplan, primarily produced by Paul NZA and Marek Pompetzki, was released on 7 March 2008, throughout German-speaking Europe.

[10] A reissue of the album was released on 19 November 2008 and included the previously unreleased song "The Unforgiven", a Metallica cover which became her second top ten hit in Germany.

[11] In support of the album, Heinzmann embarked on a festival concert tour from May until September 2008, visiting venues throughout Germany and Switzerland.

Upon its release, Roots to Grow reached number four on the Swiss Albums Chart and made it to the top twenty in Germany, but was less successful than its predecessor Masterplan (2008).

[14] Again, she re-teamed with NZA and Pompetzki to work on the album, also involving contribution from singers and songwriters Eric Bazilian, Julie Frost, Jamie Cullum, Ian Dench, Alice Smith, Sharon Vaughn, and Kim Sanders.

"[15] Also 2012, it was announced that Heinzmann would join the jury of the debut season of the SRF 1 reality talent show The Voice of Switzerland in 2013.

[18] In May 2015, Heinzmann along with singer Miss Platnum and dancer Bella Garcia joined the jury of the German revival of the RTL II network talent series Popstars which tracked the making of the short-living girl group Leandah.

[20] In September 2018, Heinzmann released the single "Build a House", a collaboration with German DJ and producer Alle Farben.

Taking Heinzmann's further into the dance pop genre, it reached the top forty of the Swiss Singles Chart and preceded her fifth studio album All We Need Is Love for which she consulted producers Steffen Graef, John Gordon, and Sune Haansbæk to work with her.

Her debut performance of Marilyn Monroe's "Diamonds Are a Girl's Best Friend" placed last, resulting in her elimination at the end of the first episode.

[27] In March 2021, Heinzmann along with Johannes Oerding, DJ BoBo, Joris, Gentleman, Nura, and Mighty Oaks lead singer Ian Hooper filmed the eighth season of the reality television series Sing meinen Song – Das Tauschkonzert, the German version of The Best Singers series.