>>2679550OP, as someone who took a girl to Colorado for /out/, this is a poor idea. if she doesn't want to ski and doesn't want to camp overnight, your day hike options are pretty limited and she would probably complain about being really cold. Without the motivation of attention or validation most women don't do the schizo /out/ stuff men do.
I would ski if possible. Epic pass is closed but unless you have mountaineering experience, you are going to get better views and have a more fun time than winter hiking. the winter "hikes" are all pretty low in elevation. doesn't mean that they are bad but if there isn't snow there could be rain.
also, remember that acclimatization is painful and takes time. Yes, you could waltz up to 14k but without knowing how your body speaks you could end up in big trouble.