OP, imo, you’re now thinking along the right lines. But after AP Span, they won’t be expecting AP Span lit. Think about how to use that slot.
Ucb, my response was after someone posted that AP stats would somehow put you ahead of the humanities competition from other top applicants. It’s the calc that will help. And the fact she has good ECs to back up her interest in poli sci or related.
Many on CC turn to what happens when you’re in college, what helps prep for x and y classes, what gen eds, etc. The reality is, first you need to be admitted. And this is about Princeton (and, I assume, othe top competitives.)
OP, make sure she has other ECs, as well. A balance. Imo: what reflects your interests and future goals, what supports peers (clubs, whatever else,) and what serves the local community, working with needs around you.
Best wishes.