Hmm. Interesting thread.
I personally have my sights set on one of these:
http://www.sweetwater.com/store/detail/G5622TCBRRI don't have anything in my arsenal quite like that yet.
But that's not really a suggestion. As you are well aware, instruments can be a very personal thing.
You say she is away at college. Will she be coming home for her birthday?
If so, would it be possible for the two of you to go on a mission to a local music store to acquire her new guitar?
A few years back, I set out on such a mission, accompanied by my wife, Donna.
I spent four of five hours in the acoustic room, with mild intervention from the attending salesman who realized that we were on a mission. Donna handed my selections to me as I played them in A/B comparisons. We whittled the field down to this one guitar that I kept coming back to. I did have a self imposed hard ceiling on the price.
I walked out with a guitar that I love, Donna helped select it, and we have the memory of some quality time spent finding something important to me, and vicariously to her.
I'm sure a similar event would mean a lot to a budding 18 year old guitarist.
That aside, I rather like the idea of the Variax. While I can understand Spacey's disdain(criminy, the man builds gorgeous instruments and winds his own pickups!), the Variax offers more sound flexibility than any one guitar.
It may not be the most premium instrument, but could be invaluable in finding that sound she wants to make hers, and ultimately get the premium guitar that is that sound.
Just some thoughts. hth.