Is there no security on these Subways?
Seldom, usually if there is, he'll be stationed in one car for a few stops,and not move from his place or if you're lucky, a transit cop will wonder on by accident. The subways in NYC are horrible like that, you usually just hope that you're at a popular stop or on a popular train with lots of foot traffic to add a little safety to your travels.
In this this case, she might of gotten a ticket, if she was caught.