Honestly, I fully understand the desire to have a path figured out, but you’re worrying too much about having everything nailed down, and about having an extracurricular resume that fits this plan. If you end up deciding to go to law school, that’s great, but you 100% do not need to have law-related EC’s in high school! You don’t have to major in anything law or public health related, either. A sociology major, for example, would lay a great foundation for either public health or law.
Have you learned about the concepts of convergent vs. divergent thinking? Both are necessary and important to the long arc of a decision process, but it seems as if maybe you find divergent thinking anxiety-provoking, and really, really like convergent thinking that brings you to a clear conclusion. The problem is that if you don’t become comfortable with uncertainty in a way that lets you explore and think divergently, you may miss out on some of the best ideas you might have come up with for your future!
I’m not saying that public health and law are bad ideas. They’re great ideas, and I think it’s terrific that you’re exploring these possibilities. But you don’t have to have a firm decision now, or even when you start college. It would be more than fine to frame it as, “I don’t know exactly what role I want to play in the future, but I know that I want to work to correct racial inequities, possibly in the context of health care. So I want a college education that will give me a strong background in why those inequities exist, and what interventions work best to combat them.” You literally don’t need to know more than that until after you get to college!
There’s no need to “take a lot of legal classes over the summer,” at all. I can’t even figure out what kind of “legal classes” are available to high school students, that would be useful. Volunteering at a health care facility, just to get real-world experience, would be as useful or more so.
And the schools you were already considering would still be fine!! Certainly Howard and Spelman both have multiple majors that would prepare you extremely well for either of these paths, or for another path you haven’t thought of yet. Drexel has an undergrad public health major, which isn’t necessary to pursue a public health career, but it would likely get you co-op placements that could give you great perspective on what you’d like to do. Agnes Scott also has a fantastic undergrad public health major, in cooperation with Emory, that gives a head start on grad-level public health coursework (maybe that would be a selling point for your mom). (Also, public health law is a thing as well, so it’s not either-or.) I don’t see anything about your shift in perspective that disqualifies any of the schools you were thinking about; if anything, the “fit” of your existing list got better!
You’re doing great - don’t worry so much Try to think divergently - brainstorm multiple ideas, even if they’re mutually exclusive - now isn’t the time for narrowing down, but for embracing many different possibilities.