Don't be surprised if she picks something you'd never consider. When my fiancee was looking for a cheap bike to take on an European tour, I was looking for a small framed touring bike for her. We wound up with a purple mixte, because she loved the way it looked (it was suited for the task at hand), and what she placed importance on wasn't even a consideration to me. Her last road bike was picked because of a color scheme she liked (and again what she is doing with it, the specs were more than adequate).

So long as the bike meets the requirements for the task at hand, what she wants far outweighs what you find important. Just go with it, she's far more likely to ride something she enjoys than what you find to be important!