Ellegaard was a member of the Danish team that won a silver medal at the 2005 European Youth Olympic Festival.

At the 2006 World Junior Curling Championships, Ellegaard was the alternate player for Nielsen's bronze medal-winning team.

The following year, she won another bronze medal, this time throwing third rocks for Madeleine Dupont at the 2007 World Junior Curling Championships.

Later that year, she won a bronze medal at the 2007 European Curling Championships as the alternate for the Nielsen team.

Dupont and Ellegaard played in the 2008 World Junior Curling Championships as well, finishing 5th.