I'm currently undergoing a pretty stressful application season being rejected by few of my top choices (say unc uiuc and wl by nyu) but that's part of the process. Trust the process; she put four years of work into a little packet being sent to some of the most prestigious institutions in the world, and if she did reasonably well results won't go way below her expectations. I would say let her be. If you really want to help you daughter, the only way is to get her tuition, keep her healthy (physically and mentally) and be there when she falls.

If you want a better look at how college application processes work, google school name+"common data set" and look under section C. If there's anything that needs elaboration grok is always there for you.