Well, investing your money to create your own line, basically starting your own business, is risky isn't it. Whereas going to school, even though it's expensive, would give her something tangible in the degree that she receives. Plus I'm sure the experience there would help her out, since coming straight from high school, how would she know where to begin to start creating her own designs?
I'm not arguing for going to school there, just bringing up possible advantages. Do you have any experience with that industry?