(More spoiler space)
I believe Quinn (and the Fashion Club, mind you) saw Tom on the float in "ILAP". Quinn certainly didn't react to Tom then. Also, Tom mentioned to Daria from his "car" in front of her house in "DDMD" before you-know-what happened, something to the effect of several girls (presumably the Fashion Club) rubbing their faces (with make up), and not wanting to be around them in the house when Daria came. This indicates Tom probably met Quinn then, asking her about Daria's whereabouts, then more than likely going back out to his car to wait for Daria.
I speculate that Quinn may have had a tiiiny spark of hope when Tom saw her then, but took glance at his Pinto, and immediately decided to let Daria have him. After all, one of Quinn's "requirements" to like a guy is what car he drives, remember?
Of course, if anyone saw in the MTV "scrapbook" what car Tom is driving in the movie, then Quinn might want to "consider" Tom--not that it would do her any good, of course. Thanks.
-Steven Galloway