How many AP courses should DD take if she wants to go to a good college (but not Ivy)?

@PP:
by "good" SSAT scores, do you mean 2000+?
Does Madeira have that self-segregating atmosphere of most private schools?
What is swimming, lacrosse, and volleyball like at the school?

Electronics. iPhones, iPads, etc.

Anyone familiar with Madeira? It's an all-girls school near DC.
What are the girls there focused on--academics? athletics? arts?
Co-curriculum, activities, academics, athletics, etc. - what is it like?
Admissions - how difficult is it to get in? SSAT scores? What do they look at?
DD likes the school a lot. Personal anecdotes and/or other opinions all welcome.