Dee's universe doesn't contain artificial gravity - only the real sort of gravity you can find on planets, and the fake "gravity" that comes from spinning things around. You can see the outside of the ship she's aboard at the picture at [link] , including both the rotating bits, and the bits that don't rotate and don't even have fake rotation-gravity.
Unlike in some Hollywood movies, it takes some time for all the air to blow out of a hole. For a hole that's one in square, and a compartment that starts at one atmosphere of pressure, and a compartment the size of a 20-foot cargo container, then it takes over half an hour to drop to 80% of normal pressure. There's a handy reference page at [link] with more details, if you're interested - that whole site is a goldmine of useful info.