We like to imagine that Dr. Lisa will drift forever into the void (like George Clooney in that space movie I watched on the plane that one time), but more likely she would just follow the same orbit as the shuttle. This would, perversely, turn her into a form of space trash. The United Nations has regulations against littering in space. But I doubt anyone would apply those regulations to Dr. Lisa. Again, no one wants to call our noble Lisa trash!