Delta's Rejected Daughter

Melanie Miller is destined to become Delta of the Brookwood Pack but not if her Grandfather has anything to say about it. Her Grandfather is old-school and wants her brother Daniel to become the new Delta instead. Also, she works at the family business--Hunter Security Firm. She heads a division that requires her to be in contact daily with pack Alphas, as well as the Alpha King in the U.S. Why does her Grandfather only have a problem with her being in a position of power within the pack?