I'm a graphic designer graduating in a month, and contrary to what Mavgirl said, it *is* a great field to get into right now, assuming you're willing to bust your ass to make it. My school (Arizona State) is not well known for its design school, but its the best in the state and curriculum and faculty wise, our program can hang with some of the best in the nation (Carnegie Mellon, etc). It just depends on how hard you are willing to work. A graphic designer is forced to wear many hats these days (which is the fun part of it all), including designer, producer, developer (for web and interactive applications), photographer, researcher, etc. While web design is a major part of our curriculum, I took it upon myself to really hone my HTML/CSS/JavaScript coding skills to allow me to translate my designs from identity to print to interactive. It's this multi-faceted nature as well as the drive for success that separates the men from the boys in our industry.
I came from a similar history where I was very rooted in art (visual art + photography + music) but didn't really want to pursue either of the three because there isn't a whole lot of money in any of it or were too bohemian for my liking. Commercial arts were the obvious choice, and there I landed in graphic design.
Though I am graduating in a month, I just accepted an offer for an integral position at a *very decent* wage (more than any business/marketing/communications/whatever student i know) at a leading digital design consultancy in New York City, and received numerous offers from other leading design consultancies as well as very well known digital start ups. If you have the drive to succeed and design is something you find a passion in, it is very doable. If she is skilled at art and loves to make things, there should be no difficulty in translating over to design – it's the same thinking. Business/marketing/communications majors are a dime-a-dozen and NONE of those degrees are going to make any money (or have any luck being employed) directly out of school. Architecture is also very hard to break into these days and you will spend 40 years working on other peoples ideas before you can create your own stuff. Obviously you get out of it what you put into it, but if you work hard enough, the opportunities will be endless.
If you'd like to continue our conversation please please PM me or email me… I'd be happy to talk more.