Amber Barrett was the hero for Köln as she scored twice against bottom of the table Jena to all but secure survival and stay in the Frauen-Bundesliga.
The Milford woman came on at half-time as her side trailed 1-0 but scored twice and set up the other goal to win 3-1.
Barrett scored a penalty on the hour mark before setting up Mandy Islacker to give Köln the lead.
Barrett made it 3-1 on the 76th minute to secure the three points as newly promoted Köln move to 19 points, 11 points ahead of SC Sand who occupy the nearest relegation spot.