well, in that case, i use the Greddy TT gen 3. you can pick one up from ebay for ~$100 and install is pretty straightforwar d with 4 wires.
as a note, audi's don't allow you to use the key fob to lock and unlock the doors while the engine is still on. if she's dumb enough to not care about the car/turbo, then she's definetly gonna be too dumb to realize that you have to manually lock and unlock the car if the engine is still on.
i give you 2 days before she gets her car stolen.