Ms. Heybenstance is an old demon witch that lives down the road. She’s a master of black magic, demonic incantations, evil spells of sorcery and makes a mean apple pie.
Ms. Heybenstance will eventually help DeathSpank look for The Artifact which she was responsible for protecting.
You can find her at Heybenstance.
A very similar character called Hannah Heybenstance appears in DeathSpank: Thongs of Virtue. It's currently unknown if they are related (or even the same person, for that matter).
It is also possible she maybe the sister of Gretchen Heybenstance.