Is this typical of her (over-committed, maybe some perfectionist tendencies?) or is this new? If it’s new, I’m with Thumper- ignore the subject of college for now and see where it goes. If this is a pattern with her, I’d be more interventionist.
Does she have a good relationship with her guidance counselor? Sometimes hearing “you need to cut back” lands better when it’s not from a parent…
I think you support her by telling her that her health is Job 1 for a parent. So she gets to roll her eyes at you, but she isn’t allowed to snap when you remind her that sleep, healthy meals, etc. are non-negotiable. And that you trust her to figure out how she’s going to manage the things she’s involved in but that you’ll support her decisions.
Are these clubs things that she really cares about, or are they leftover commitments from sophomore year? If so- that seems to be an easy decision- dump the things she no longer cares about!!!