OPSEC starts with observation.
Do you see what she missed?
The issue here has nothing to do with the USB.
Observation is the foundation of every security discipline, threat detection, phishing identification, social engineering resistance, physical security.
All of it depends on actually seeing what's in front of you.
If you can't register basic environmental data, you're not going to catch the typosquatted domain, the slight URL mismatch, or the badge that doesn't look right.