All of her family
Disclaimer: I don't own Pretty Little Liars, whoever owns Pretty Little Liars does.
She knows that Cece is A. That A is out to hurt her family. All of her family members, and she waits in the dark watching A. Making sure that when Cece hurts her twin, that she'll strike at her first. She knows that her parents placed her in Radley for a reason. She doesn't think she's crazy, but she did attack her twin sister for stealing the dolls. She watches A like a pray stalking its next kill. She does need to watch to see how her sister will react to all this. But she knows that she doesn't like when other people touches her own dolls. And A needs to learn that her family members are off limit.