actually I feel math is the best!

she can have arrangement like a 'dual Bachelor degree' of 'Math & Computer Science'.  Math is the fundamental preparation for advanced career such as - computer, finance, economist, business analyst in many area like risk management, Wall street position. etc.

Except medical school, many careers nowadays need a fundation in Math and many people lack it!  Big company in Fortune 500 level many senior position need people with Math background!