Sounds like the tank isn't venting well. I'd crawl underneath, or since it's your girlfriend's car, have HER crawl underneath and check the condition of the fuel filler and vent hoses between the filler neck and the tank. The vent hose will be the smaller of the two, and it may be pinched or collapsed. 11 years of exposure to fuel can soften up these hoses and make them crack, leak, or collapse.
Contours have fuel filling problems anyway, usually due to the flapper/anti-spashback valve where the fill hose meets the tank. Usually, they restrict fuel filling speed, I can't have the pump flow on anything but the first, lowest flow setting.
1985 SVO Mustang (turbocharged track whore), 1989 Taurus SHO (supercharged track whore), 1999 SVT Contour (Sedanus-Grocerygetter-Rapidus), 2008 Mercury Milan Premier (Comfy boat).