Kromowidjojo's first major tournament in 2008 was the 2008 European Aquatics Championships in Eindhoven. In the 4 × 100 m freestyle, she won the gold medal and with the team: Inge Dekker, Femke Heemskerk and Marleen Veldhuis. They broke the world record with a time of 3:33.62. With the same team she finished fourth in the 4 × 200 m freestyle. Individually she finished 9th in the 200 m freestyle. A few weeks later at the 2008 FINA Short Course World Championships in Manchester she won the world title in the 4 × 200 m freestyle relay and broke another world record, again with Dekker, Heemskerk and Veldhuis. After the 100 m freestyle heats she withdrew from the tournament with an elbow injury.