Well the answer is, because Michael can figure out how to fake someone's breath for the next scene. If you didn't think Michael was the kind of person who puts her own priorities over common sense or anyone around her from the first episodes, it is affirmed here, as she immediately goes into a top-secret facility in her first day out of prison. She blatantly lied to Saru when she said she wouldn't make trouble, and for what reason? Because she is curious? Really? Well the fake breath gets her into the ship's green room, which has a purpose to be discovered later.