Grace Dixon, nee Harris, was the house Matron at Lachlan Fredericks' (who was a warlock) manor, and an ancestor of Abigail and Jennifer Mills. Like Fredericks, Dixon was also aware of the supernatural evils outside of the manor.
A Saving Grace[]
Thanks to her journal, Abbie was able to save Ichabod from his lethal brain fever, or in his case from Hell just before his vessel would get incinerated and die. She also guided Ichabod to ascend back to the world of the living; though it was unknown if it was either her spirit, or perhaps Abbie's.
Sleepy Hollow, the Missing Episodes[]
Grace was seen in Heaven and she was one of the angels declaring it's time to gather the current wielders of the seven, sacred Virtues. She used to wield the virtue of Faith, and she passed it down to Witnesses in her bloodline and soon to Jenny. She was also one of the spirits encouraging the heroes to defeat Lucifer and restore the world.