Either CS or psychology could be somewhat relevant to business.
Has she taken AP CS principles yet? That might be a better overview of CS for a student who will not major in CS, although it may not get that many “rigor points” from a college admission reader. Or she can go through https://cs10.org if she just wants to learn about CS without worrying about credit.
AP CS A is programming and data structures that is more for likely CS majors.
Does she have all of biology, chemistry, and physics for science courses, and what level of foreign language has she completed?