Lila was close friends with Lexus, the two were inseparable. Their parents were sure they were mates, but life isn't perfect.
When Lexus finds his mate, he starts to ignore Lila. When he does talk to her, he sounds annoyed all the time. So, Lila steps down from the beta position and moves on with her dream. To become a doctor.
She leaves the pack, her family, and Lexus so she could go to school.
Only to return eight years later to find the new, Alpha Lexus.