After graduating from the Liebfrauenschule Köln [de] and studying German and history at the University of Cologne, Rosenfeld volunteered at the Berliner Tagesspiegel.

In 2009, Rosenfeld moved to the capital office of the time, where she last wrote for the political department.

[2] From 2011, she was married to Christian Lindner, then General Secretary and today's chairman of the Free Democratic Party (FDP), with whom she had previously been in a relationship since 2009.

In late 2017, the self-regulatory body German Press Council issued a disapproval of Die Welt: Deputy editor Dagmar Rosenfeld had published before the federal election 2017 "styling tips for politicians" and advised, among others, the candidate of the FDP, Christian Lindner:When choosing the outerwear for commercials in the future, ask the wife.

[6]However, since Rosenfeld herself was the wife, the press council attested to "an objective bias on the journalist.