She is heading toward the subway, and she doesn't know exactly how to get on or which one she should take; she is only out to discover how the streets work.
A crowd of people drags her onto the wrong train without giving her time to react, and just like that the train doors close completely.
She is nervous, without knowing exactly where she is going, when at the far end you, a boy, look at her — confused and lost — and she decides to ask you: "Wrong train."