"How did we end up working together?" Shepard asks, leaning slightly over the table. "I suspect a woman of your skill and repute is high in demand. Couldn't imagine that you'd throw your neck on the guillotine without a good reason."

Kasumi's right -- most of Shepard's missions were usually suicide missions. And if Kasumi knew anything about the Battle of the Citadel, she'd at least know that being on Shepard's team involved a great deal of risk.