You can go to this year’s UIUC, Purdue, and UMD threads to get a sense for applicant stats.
Yes, that is a downside of Naviance…don’t know which students have hooks, which college/major they applied to, etc. Your GC should be able to help you there.
I would not count on any merit at UIUC…there is very little merit for in-state students too. Others can answer about Purdue and UMD.
Lastly, I do want to say that even though I would categorize UIUC BME as a reach, I absolutely agree that the single digit reach schools you mentioned above (JHU, Vandy, Rice etc) should be on her list as well. Categorizing is somewhat on art, and we only know your D’s stats…not her essays, ECs, LoRs, etc.