7 Things We'd Really Like to Know Before the End of Pretty Little Liars

We first meet Sara Harvey in the dollhouse with the girls, but we later learn that there's a lot more to her. After revealing herself as "A" and Charles DiLaurentis, CeCe Drake (aka Charlotte) explains that Sara Harvey had previously dressed up as the Black Widow and Red Coat.

The real question is . . . why? What does Sara have to do with Charlotte in the first place? How did Charlotte convince Sara to help her in such huge and sinister ways? We have the feeling there's a lot we're not being told.