My interpretation
After viewing, I reflected on the seemingly nonsensical story and certain things started to make sense: This is only a story about a Druid witch coming back to life on the surface; it's really about a woman in bondage to alcoholism who comes face-to-face with her lower nature -- her self-destructive side (her "id" or "flesh") -- not to mention confronting her incestuous uncle -- and trying to prevail. Going back to her home town -- her heritage, her roots -- enables her to see WHY she turned to alcohol for succor in the first place.
In essence, this is a Gothic tale about the purging of one's fleshly demons.