when i saw the scene my first thought was “how the heck is she alive?”
People have survived being exposed to the vacuum of space before. Also remember that she is surrounded by the air that got blown out of the ship, which she could have subconsciously kept around her using the Force.
What really strains credulity is someone surviving three of their limbs being hacked off and being barbecued beside a river of lava, or literally being cut in half and falling down a bottomless shaft.
Force users are weird like that.