Assassin's Creed

Rachel, is the Chalice's reincarnation, but due to Adha's death, the only way to wield her dormant power is to meet one again the love of her life. So how is Quinn, daughter of the Templar Master, involved in all is? And why is Rachel still the school's pariah? Considering she could access her power at the tender age of 4 and had mastered it already by 16 she should rule it, right?