Following secondary school, Köster began training to become a nursery-school teacher, which she broke off three weeks prior to completion.

She was surprised when the text she had submitted was actually used on the German radio station WDR in the programme Unterhaltung am Wochenende, broadcast on Saturdays between 4 and 6 pm.

At the beginning of 2008, Köster cancelled her Wer Sahne will, muss Kühe schütteln tour, which had only started a few weeks before.

She appeared on 7 September 2011 for the first time again following her stroke on the RTL Television programme stern TV [de].

[5] Together with Till Hoheneder, Köster wrote the book Ein Schnupfen hätte auch gereicht – meine zweite Chance about her stroke and the time that followed.