I can second the importance of community service. My L’ville interviewer made of point to bring up a few times that my community sericive involvement was an asset to my application. She even said I’d be suprised at how many kids haven’t really been involved with any volunteer work.
Make sure your D can explain why she enjoys doing volunteer work and what impact she hopes to make. Doing something for the sole purpose of writing it on an application is rarely helpful and can often be easily seen through.
You definitely have a huge head start, which can be very helpful. I recommend that you encourage your D to explore things she is passionate about. Not only will that help with the application and interviews/essays, it will ensure that no matter where she ends up for HS she will have skills and experiences that she truly enjoyed.
I didn’t decide I wanted to attend BS until November of 9th grade. Planning this far in advance may work great, but it’s certainly not a prerequisite for good application results. I agree with @Calliemomofgirls and caution you to aproach BS admissions as a “potential future opertunity” rather than a goal you and your D must be in active pursuit of for the next four years. As I’m sure you know, kids’ opinions can change drastically. I wouldn’t assume that what your D wants today will align exactly with what she wants 3-4 years down the line.