Hehe, nice try.
Anyway the safety factor on SUVs is really misleading. Try and get her looking at a Subaru or the Passat 4-motion. An AWD car would be much better on snowy roads and safer to boot.
Honestly I think most people use the 4WD thing as an excuse to buy a status symbol. That's all SUV's are to the majority of people who by them. We get a lot of snow here in Toronto too. But the traffic slow to a crawl and there really is no need for AWD. You just get going faster but FWD, RWD, AWD cars all stop the same. Lighter would actually be better.
Try that argument on her.