With a 14 mile ride each way, I'd say the lightest road bike she can get for the price she's willing to pay. Depends on whether it's city or rural or suburban riding and whether she really plans to ride through any weather. I have a 13 mile commute on suburban roads (the same roads the roadies take their weekend rides on), so my commute is more like a medium fast training ride with a fanny pack carrying my lunch and work essentials. Something that can take a rack for paniers is a plus, but only essential is she carries alot each day. Fenders only essential if she rides in rain regularly. Lights can be mounted on any bike. I wouldn't use upright bars for a this length commute unless it was mostly city riding. The faster she covers the 14 miles, the more likely the commute will be an acceptable ride, imo. Think of checking the clock every morning and saying "If I leave now by bike I get to work at x:xx, if I leave now by car I get to work at y:yy." It's a decision every morning that will favor biking more often if x:xx is not too much later than y:yy. And if the biking is FUN.