Another would be Anna Murphy from Eluveitie. Met her a few times and she is very much in the metal mindset and friendly to boot! She not only plays a badass instrument(hurdy gurdy) but does vocals. These vocals can be carrying a very nice harmony and really get into the metal mode! Love her voice!
15 Seconds in is Anna. Also throughout with back and forth with Chrigel(lead singer)
Singing in Rose for Epona
Her jump into getting into the metal spirit was Quote the Raven from their last album. FF to 3:25
Shot with Anna last time they were in town -