One of the profs at one of the universities she contacted suggested that she avoid trying to get AP/college credit for introductory bio b/c it would be better to take courses in your major @ college.
The introductory freshmen courses in biology, chemistry, physics, calculus etc. are the universities' cash cows, and this is likely a factor in their not wanting students to skip these courses. If a student gets a 5 on the AP exam and if all of the topics on the course syllabus are things she has studied, I think she probably should skip the intro course.