I wonder where was Hilgya when she learned Durkon's location. Was she at Dwarven lands or elsewhere?
She arrived in one day... Did she windwalk? Or just walked underground?
If she was in Dwarven lands taking care of Durkson then it means her Husband and her clan have learned about here son... Did she divorse? Was she expelled from her clan? All the more reasons to get her revenge...