Just a slight inconsistency from your W's message to your BIL. And I might be over-analyzing this, but does it strike anybody else as odd that in one breath she tries to give the impression of someone who is deathly afraid of SD, then in the next breath, she says things he does "pisses her off"?
Could be splitting hairs here, but it strikes me as inconsistent to include those two statements/emotions in the same email. Typically, if someone is fearful of their life/safety being threatend by another person, they become somewhat submissive (think battered W syndrome). Having a sense of being pissed off, at least to me, does not indicate submissiveness. Rather, it indicates superiority, as in how dare him, not oh God am I scared.