http://www.math.buffalo.edu/rur_index.html has some quizzes that she can try to see what she needs to review.
“Are you ready for Calculus I?” tests precalculus knowledge.
“Are you ready for Calculus II?” tests calculus 1 / calculus AB knowledge.
“Are you ready for Calculus III?” and “Are you ready for ordinary differential equations?” test calculus 2 / calculus BC knowledge.