[Bella:] …I realized that most of the werewolves were unprotected. I was about to reach out to them when I realized that… if the Alpha was under my shield, the rest of their minds were every bit as protected as his. (37.15-16)
Bella learns that, thanks to their mental connection, protecting their leader will protect the others from Jane's powers. Great. On the flipside, it's safe to assume that if Jane got to Sam, she would hurt the others as well.