Dekker began in 1990 with the rowing. Already in the youth field, she won her first international medals; at the Junior World Championships in 1995, she received the double sculls with Christel Rijnten the bronze medal, a year later the two were victorious along with Karin blade and Maartje Breeman in the quadruple sculls. 1997 Femke Dekker stepped to the One, finishing in fifth place.
At her first Olympics start in Sydney in 2000 Dekker joined together with Marloes Bolman at the two without coxswain, finishing in tenth place. In the 2001 World Cup season Dekker launched in the quadruple sculls, but changed for the World Rowing Championships in Lucerne back to the belt boats. She went to the four without coxswain and aft; while the Dutch women occupied the eighth place with the roller, the back four without winning in the occupation Christine Vink, Carin ter Beek, Anneke Venema and Femke Dekker the bronze medal behind the boats from Australia and New Zealand.
2002 Femke Dekker joined internationally only in the quadruple sculls at the World Championships, she finished eighth. 2003 rowed Dekker along with Froukje Wegman in the double sculls, the two arrived at the World Championships the B-final and total occupied twelfth place. 2004 Femke Dekker approached in one and finished the World Cup in Munich in third place at the Olympic Games in Athens, they did not reach the A-final and finished as four years earlier in tenth place.
After Dekker had occupied at the first World Cup regatta in 2005 with Sanne Beukers in the double sculls seventh place, both changed in the eighth and occupied the next two World Cup regattas with Dekker at bat in second place. Before the World Rowing Championships in 2005 retired from Sanne Beukers out of the boat. In the occupation Femke Dekker, Nienke Dekkers, Nienke Hommes, Hurnet Dekkers, Annemarieke van Rumpt, Laura Posthuma, Annemiek de Haan, Helen Tanger and control woman ester Workel the boat finished third behind Australia and Romania. 2006 Dekker joined the World Championships in the quad to no and there occupied the fifth place. 2007 Dekker was back in the aft; after the World Cup victory in Munich and two third places in the other two World Cup regattas corresponded to the seventh place in the World Championships did not meet expectations.
2008, the Dutch eight finished third in the World Cup twice in fourth place, the season's highlight, the Olympic Games in Beijing the aft reached in the cast Femke Dekker, Annemiek de Haan, Nienke Kingma, Roline Repelaer van Driel, Annemarieke van Rumpt, Sarah Siegelaar, Marlies Smulders, Helen Tanger and esters Workel second place behind the aft of the United States.
2009 Dekker joined the World Cup Finals on the Rotsee in Lucerne both without and four in the aft on, after the victory in the four she took in the aft third place. This success repeated the Netherlands team at the World Championships in Poznan: after Chantal Achterberg, Nienke Kingma, Carline Bouw and Femke Dekker became world champion in four, they won together with Nienke Groen, Claudia Belderbos, Jacobine Veenhoven, Sytske de Groot and control Anne Schellekens Bronze in the eighth. 2010 ranked the eighth in the World Cup in Bled and at the European Championships in second place, the boat is placed at the World Championships in New Zealand in fifth place; in four without defending Achterberg, Kingma, Bouw and Dekker her title from the previous year. At the 2011 World Championships in Bled, the Dutch roller occupied again in fifth place, the back four without new in the cast Wianka van Dorp, Olivia van Rooijen, Elisabeth Hogerwerf and Femke Dekker was awarded the bronze medal.
The 1.86 m wide Femke Dekker began while studying for Nereus Amsterdam, now starts the marketing specialist for the Rowing Club The Leythe.