Spencer Hastings is an overachiever. She tries to do it all, from school, to intersnhips to charity work and field hockey.
Spencer would actually stand up to Alison back in the day, but she has problems at home with her annoying sister, Melissa. How does Spencer get back at her? In the opening episodes, by crushing on Melissa's fiance.
Aria: What do we do know? We just wait until A paints the town red in our DNA?
Hanna: One drop here, one spot there, and kaboom; we're all sharing a jail cell with Ali.
Spencer: You are like the queen of not helping!
Hanna: Any sense of boobs?
Hanna: What? It could be a clue.