Your girlfriend aimed the camera at herself to take basically an old school selfie. In a flash the camera took the picture and the Polaroid photo came out.
"Oops, I forgot it takes a few minutes." she said, then she's taking it out and waving it to speed up the development.
"I see you tested it out. At least it works and we didn't need buy a $15 paperweight." you said
"Even if it didn't work, I would like to put it nice on the shelf." said she waiting for the picture to come out. "Hmm... that's odd."
"W...What is it, something wrong?" you asked.
"The photo must've got mixed with an old photo or something. The picture does show the apartment, but I'm not in it." your girlfriend explained.
"What do you mean?" you asked.
"There is only..."