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Without using source control, the best way is described on Peter Grainge's site with projects zipped up on the network drive and unpacked to be worked on locally. Part of your problem may be the USB method that you're using - try putting the project on their C:\projects\project_name\ folder and working with it there.
At the moment, I'm copying my local project folder to USB to copy on her local project folder. The USB drive only asks as the file transfer mechanism for the moment.
What bothers me is the fact that it's the exact same files. I'm just opening the project on a different machine.
I will take a look at Peter Grainge's solution and post my results later.