Of course she was after the shock factor - that's what ounts if you're 19. Maybe the driver didn't handle it well, but I think you have to weigh in that he didn't want to risk some of the other passengers - on board alreadyor who might join later - to gt angry or derisive, run riot and shout, or even get threatening, when they spotted this leashed girl. I'm not saying he cared much about her, but it's his job to avoid getting people fighting in the bus.
Sometimes it's curious how people will be saying, or aiming for "I'm out to make an action statement here that's gonna blow people's minds, toss their thinking upside down, I'll be shooting totally straight" and then they crack up and feel insulted when they do get a reaction and it's not 100% respectful, don't get an attitide of, like, "thanks for exposing our prejudices". You don't ride the bus in order to be Pink or Ziggy Stardust.