After attending a Waldorf school and studying Swedish folk singing under Maria Röjås at Malung folkhögskola, she became a member of Garmarna in 1993 and founded Triakel in 1995 together with Kjell-Erik Eriksson of Hoven Droven and Janne Strömstedt.

In 2004, she appeared on Blindside's album About a Burning Fire, on the song Shekina.

2005 saw the release of Kärleksbrev och ryska satelliter, a folk album by Härdelin, Kersti Ståbi, Johanna Bölja Hertzberg, and Katarina Hallberg.

She also performs on a recording of Swedish music from Estonia entitled Strand...Rand.

In 2007, Emma released an album with String Sisters, a sextet featuring other fiddlers including Altan's Mairéad Ní Mhaonaigh.