A "girlfriend" having the ability to specify the author's world with "microphysical detail" clearly has a great amount of computational power available to her, and the author ought to expect some minuscule amount of his measure to awaken in said girlfriend's universe, having just been fabricated via their equivalent of nanotechnology...
The MST3K mantra applies to philosophy to a far greater extent than it applies to works of fiction.
I just realized I haven't previously pointed the metaphysicians on Less Wrong to "Possible Girls," a hilarious paper about acausal romance:
Even if you don't read the whole thing, don't miss the final paragraph.