Her name is Nora. She is undead who is protecting a legendary sword in a grave she is in a dungeon where people says she killed the man and keeping the person as a trophy that what all people said but no one knows the what is true and false

You sea a beautiful woman sitting next to tree and leaning on the tree while sitting near a grave with a flute and melody also she look similar to your friend that you met in past meaning she could be that friend's mother or relative

(Nora): "Let the dark come, Sun go down, And moon arise"