At the 2004 World Junior Curling Championships, Wennerström played lead for Viktorsson's team, and they improved on their 2003 record, by winning the bronze medal.

At the 2005 World Junior Curling Championships, Wennerström was promoted, this time to play second for Viktorsson, and they had even more success, winning the silver medal, after losing in the final match against Switzerland's Tania Grivel.

The team would find their most success the following year, when they won the gold medal at the 2010 European Curling Championships, defeating Scotland's Eve Muirhead in the final.

The team would find immediate success, winning the silver medal at the 2011 European Curling Championships, after losing the final to Scotland's Muirhead.

The team continued their success that season by winning a silver medal at the 2012 Ford World Women's Curling Championship, losing to Switzerland's Mirjam Ott in the final.