How is Mabel described in the novel, H is for Hawk?

Mabel is Helen’s Goshawk. Helen is surprised to find that Mabel has a playful side, and the two even have their own variation of fetch. Mabel is shown to be a very calm bird outside of the hunt, not even being disturbed by an earthquake at the end of the book, or reacting when Helen shouts at her during one of her angry fits. Later, when a jogger suddenly comes upon them, it is Helen who is startled, not Mabel.