Obviously having some idea of the direction you want to go career wise is a help. I was Computer Science in the Engineering school so obviously I took basic engineering degree classes and moved to upper level computer science classes as I took care of the 100 and 200 level requirements.

On the other hand, DB1 majored in visual arts history and photography and then took the mcats. He might have had more success if he had been more pre-med during his undergrad career. I have read how once upon a time kids picked majors in HS, but that was before college became more attainable for the masses.

Most schools do not require a major be selected until the end of the sophomore year. Even so, most engineering or vertically aligned degree programs require some thought and preparation so that you get the pre-reqs out of the way.

Fuskie
Who thinks the best thing for DD to do is to request course catalogs and read about the types of degree programs she think she will might be interested in...