When she left Verbotene Liebe in 1997 Niehaus went to New York City to study acting at the Lee Strasberg Theatre Institute.

[4] In 2006 Niehaus played the title role in the television series Alles über Anna.

[7] In 2010 she starred as the single mother Maja Nielsen in the TV movie Sind denn alle Männer Schweine?.

[10] In the 2013 TV movie The Beautiful Spy Niehaus played the agent Vera von Schalburg who worked for the German defense at the beginning of World War II.

[14] Since 2018, she has worked as a correspondent on the heute show, a satirical news program shown on the German television channel ZDF.