Kauste has represented Finland in seven European Curling Championships. She was an alternate at her first European Championships in 2009. The team, skipped by Ellen Vogt placed 8th. She played second and as a skip at the 2011 European Curling Championships, placing 12th. She returned the following year playing third for Anne Malmi, placing 10th. She returned to the Euros at the 2013 European Curling Championships playing second for Puustinen. The team finished in 11th place, winning the B Division, and promoting Finland to the A Division of the 2014 European Curling Championships. There, the team finished with a 5–4 record, and a 6th-place finish. This qualified Finland for the 2015 World Women's Curling Championship. At the 2015 Worlds, the team finished with a 2–9 record, in 11th place.