Well, she started out as a typical spoiled young noble girl, desperate to become the next queen of Westeros. But after years of war, death, and constant reminders that Winter is Coming, Sansa has become disillusioned with the ideas of power, romance, love, and the role of class and family in the Seven Kingdoms.
Understandably so, mind you, lest we forget how Sansa lost her virginity via legal rape to her psychopathic husband, Ramsay Bolton. Interestingly this turn of fate was never included in the writings of George Martin, who basically provided three main plot lines for his female characters: demonstrating their usefulness in combining political alliances through marriage, providing male heirs for their Lords, and/or selling themselves for men's pleasure.
Also, I think she may have strained an ACL.