I remember my D getting a 5 on AP Calc BC, her college math class covered everything in approx 3 weeks then had totally new material. She was glad that she opted not to take the credit, she said she would have struggled with the next level course.
Because of the grade deflation nature of AP is she is confident that she mastered ore-calc, maybe she should consider take it to give her gap a cushion. Is there any merit $$ on the line?