Either that or she was just shook because she knows who he really is.
Warning: Spoiler! (Click to show)
He could easily use the cancer thing to fake his death in order to dodge everyone, so the whole ricin suicide thing just doesn't make much sense to me. He's already shown that he could pull the trigger on himself in the first season, so why use ricin?
EDIT: He also just bought a M60.. so he's obviously preparing for the possibility of a gun fight. Ricin suicide just doesn't fit.