The lack of abnomrality is a abnormality.
The demon lord should know about the hero now, and the vampire that escaped should have reported about it, albeit the information is wrong thanks to MC meddling.
But if the DL can feel the rough direction/location of the hero it means it can send enemies, if is fairly intelligent, it can even predict how the humans would level said hero...that makes me think, why can't they just force grind her like it was probably done with Stephie?
A traditional hero journey is a luxury they can't afford.