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ok dude... the problem with the wiring is that once the key turns off, the head unit totally loses power, like... you might as well unplug it. when a head unit is wired 'correclty', it actually has two power wires. one is coming pretty much directly from the battery, meaning that it'll be fused but the wire with have power whether the key is in or not. this way, it'll do things like store presets, equalizer settings, and allow you to eject a cd even when you turned the car off. that's all it'll do. it seems that this wire is your problem-wire. i'd look at someone else's car similar to your girlfriends to see where the wire comes from, or at least look at a wiring diagram for your car... i'm sure you can find them online.
the other power wire is run off the 'accessory' power coming from the ignition... meaning, that in the first stop of turning the key (remember there are 3... accessory, run, and start) now, this power wire is not has 'juicy', all it does is send power to a relay in the head unit, sort-of opening a gateway for the power wire mentioned above to power up the head unit.
-nate
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