https://registrar.vassar.edu/academic-information/transfer-credits.html describes Vassar transfer credit, including AP credit. Looks like up to 4 AP scores of 4 or 5 can be counted as course credits toward the 34 needed to graduate, but that advanced placement into higher level courses is based on department policy.
You may want to check if Vassar allows any qualifying AP score to be used for advanced placement and/or subject credit, regardless of whether the course credits are capped. If so, then there is nothing to choose in terms of which ones to use, until she considers taking advanced placement.
Are there any specific AP scores which she wants to use for advanced placement? If so, she should check what department policy is. For example, Vassar’s math department has the following recommendations for AP calculus: https://math.vassar.edu/courses/calculus.html .
A student who wants to take advanced placement may want to try the college’s old final exams for the course that can be skipped in order to verify knowledge of that material by the college’s standards.