Nope, sorry, I agree with Kramer 100%.
She's wearing a shorty helmet with 'colorful' stickers plastered all over it expressing her strongly-held opinions loudly and proudly. And some of the stickers (that OTHER people wear, sometimes) are more 'colorful' than others. So, the cop assumes hers are the 'excessive' variety.
In this example, appearance is the key. She wants to ride her bike thumbing her nose at 'the man' or 'the law' or whatever, fine, but when the man whips around and follows her based on that thumbing, well, it comes with the territory....
You lay down with dogs, you're going to get up with fleas, and all that.
And when the cop realizes that she isn't REALLY a 'bad girl' but only LOOKS like one, well, he wasn't going to just let her off at that point, and out comes the bogus 'helmet violation' ticket.