In April 2015, Kinnert began to work for the then-Vice President of the Bundestag, Peter Hintze.

[4] In 2017, Kinnert published the book Für die Zukunft seh' ich schwarz: Plädoyer für einen modernen Konservatismus (I see black for the future: A plea for modern conservatism), the title of which is a reference to the CDU's official party color, as well as her belief that party reform was needed within the CDU.

[1][5] In 2019, Paul Ziemiak appointed Kinnert as a member of the Federal Committee on Social Cohesion.

[1] In May 2022, Kinnert's books Für die Zukunft seh' ich schwarz (The Future looks Black to Me) from 2017 and Die neue Einsamkeit (The New Loneliness) from 2021 came under scrutiny for plagiarism, with over 200 instances highlighted as "extensively copied" from several German publicists and from Wikipedia after allegations by media researcher Stefan Weber.

[7][8] Until the plagiarism scandal, Kinnert was a frequent media commentator on German public policy,[9] the future of party politics and particularly conservatism in Germany,[10] and the internal culture of the CDU.