She may or may not be willing to talk it out, as well. Clearly, she doesn't want to be exposed, or she wouldn't have been so secretive. At this point, if we contact her her best option is to talk to us. We could go to the Commissariat easily enough, so the fact that we're asking to talk implies that we're not necessarily going to kill her. And trying to turn it into an ambush against us doesn't really solve her problem- we would of course have told other people on the ship to tell the Commissariat her secret if we die, so killing us doesn't protect her identity anymore. In the circumstances, meet with us and hope there's a negotiated compromise available is probably her best bet.

Or she's gone totally nutso and will try to murder us all. Macharius can try to tank, I guess. And if we have enough marines in quick-entry positions then a mob can take her down- that's a threat to Space Marines, after all.