you are just someone who she can just complain or talk to
without any problems.
What I am trying to say here, is that she is just using you to vent
her inside stress out and all her feelings, as she knows that you
do not know anything about her.
People tends to relate to people who are strangers as they will not
judge or criticize them when they speak.
Final thinking: She is just a stranger who is willing to have a
chat with you for a short time only and when the time is up, just
let it go. It will be a good memory thats all. Pushing it any
further will not do you any good.