What I would do is MANiCURE or Dope as the next single, bc MANiCURE has this chorus that gets stuck in your head, exactly like P-p-p-poker face! And I think Dope, bc maybe the mainstream people will feel connected to her bc of an sad song.. She hasn't done that...
She wrote over 100 songs and chose 15 to be on the album. Why not pick a good song from the unpublished ones for a single. I really don't see any sense in buying another single that is on the album.