@JMS111 , in general, because the IB courses require submission of work during the year, they will be more work than AP. (DS found that to be the case, and his school had both and he took both.) So yes, you’re right to focus on managing demands, and the school work is the focus during the school year. And don’t forget, there is also the summer before senior year to improve scores (and another year of math under her belt might help with that.)
I felt sick about this process beginning junior year… way behind the curve, worried that IBD was requiring DS to take SL classes that didn’t play to his strengths junior year, and completely unable to “make” him fill in the gaps. (See above on test prep.) It was kinda miserable, but he’s off to his first choice school in weeks, so it does, in most cases, work out. For him, that experience showed him that he wanted a school where students were smart and engaged but not uber competitive or driven because that’s not who he is. Sounds like your DD will show you how she wants this to play out and that you’re doing a great job of showing her options.