Seanna is the daughter of Master Dennet.
The Inquisition goes looking for Master Dennet in the hopes of securing his horses. Though he won't send them to the Inquisition until his lands are safe and he's confident that the animals will be well-cared for, he gives the Herald a horse from his own stables. He directs them to his daughter Seanna, who has prepared the horse for them. She offers to set up three courses as well. If the Herald completes them within the allotted time, she rewards them with some coin she was saving for herself.