Well, she may think it's quaint simply because it's a custom she's not used to, being an alien and all.
Or she may just find it charming because some women really dig that stuff. I'm not the type to expect guys to throw their jackets over puddles or anything, but the first time a guy kissed my hand I was completely charmed. Sometimes those antiquated gestures work, sometimes they don't. Depends on the guy, the girl and a bunch of other factors.