1. Keep up her frugal ways.
2. Do not date people who are not responsible, thoughtful, goal-driven, kind-hearted adults. Period. Promptly ditch them (politely) if they fail any of those tests.
3. Don't get knocked up.
4. Avoid debt like the plague. Doesn't mean don't take student loans IF ABSOLUTELY NEEDED in order to acquire MARKETABLE SKILLS that will PAY a salary APPROPRIATE to the amount of debt.
5. Research grants and scholarships and apply, apply, apply.
6. As soon as she is employed after school (or sooner if she's got enough grants to turn a profit earlier!), start investing like MMM and JL Collins Stock Series suggest.
7. Delay lifestyle enhancement by 1 to 3 years after school. Example: Able to live on $15,000, but now taking home $30,000. Don't inflate lifestyle to $27,000+. Instead, leave the lifestyle at $15,000 for 3 years. That $15,000 invested in Vanguard's VTSAX for 43,42 and 41 years respectively would, at age 65, result in $772,000 in today's dollars. That means she would be set for a standard retirement if she just avoided being stupid with her money afterwards. I suspect the first 6 steps alone would easily put her in the 90th or better percentile for retirees at the standard retirement age.
(According to
http://www.shnugi.com/retirement-account-value-percentile-calculator/?min_age=65&max_age=65&retqliq=772000, it's the 94th percentile.)
8. Follow the FIRE advice to retire even earlier.
***
Out of curiosity, I ran the above calculator for someone who is 65 and has no savings. 51st percentile. According to that website, 51% of people age 65 have LESS THAN ZERO retirement savings. Scary stuff.