But the good news is that she's diggin' some DS9! I may go with "Looking for Par'Mach..." next. Or maybe "Our Man Bashir" after we watch Skyfall.
Try the Visitor, that episode will emotionally pull on anyone's heartstrings.
Children of Time, His Way and Duet might also work!
Keep trying man! You may yet make a DS9er of your fiancée!