It's sad there needs to be a debate. We are talking about harassing someone for no reason. She wasn't acting suspiciously, she wasn't entering any posted high security areas. She was riding a bus. Last I checked I didn't need to go for any security clearance to ride normal public transportation.
Check again in about 10 years - you'll have to register to breathe air.
A troublemaker huh? Let me see your papers!