I think we should focus on the important point here is...she's a college age person, and likely, has far less driving experience than most here.
I totally agree with Eb, but even so, I think a younger, less experienced driver should utilize the safest practices when driving. Of course they think they're invincible and better than us mere mortals, but we know differently. Of course she thinks we're totally ancient and don't know what we're talking about.
Eb, take her out to a big parking lot and make her slam on the brakes both barefoot and in sandals, at YOUR voice command. (So she doesn't know when it's coming).
After several yrs of driving, we all are better drivers...just through actual experience. She can make her own decisions at that point.
And Dave & I think Keen's are God's sandals!(plus they're enclosed toes with very sturdy soles).