Get her in a flight school, she can get her PPL now (or was it at 17?). Whatever, get her into a flight school where she can also obtain her CPL, SE-IR and ME-IR as well as CFI, CFII and MEI afterwards.
A degree is a must but it does not have to be aviation related. She can Always get 2 degrees eventually. Also having a non-aviation related degree could work as a fall-back plan in case she loses her medical one day or decides to go for a career change.
Pilot certificates are recognized by some colleges and universities and give credits.
Let her fly now despite the 1500 hours rule to be a copilot at a regional at 23. She can instruct or do other kind of flying meanwhile.
The books that Skyhighfallguy suggested are great book to read, especially the first one -- it is my bible.