@
Ducky I agree, and that's last on my guesses.
1) Scanners were not scanning something right (maybe some sweat?)
2) Profiled because what she was carrying or bringing a long with her, like certain types of buttons or clothing is/are harder for scanners to scan.
3) Bad luck /random searches
4) Profiled because unbeknownst to her, she was acting suspiciously or differently than others, and TSA picked up on her acting differently than others. Which sometimes can minor things, like being louder or quieter than everyone else, etc.
5) Profiled for the way she looked...
Those would be my random guesses in order. I strongly doubt #5... but just putting it out there, that law enforcement does seems to be more aggressive to a certain type at the moment.