That's why I say, be natural.
And don't ask for the sake of asking or for the sake of making
conversation.
Don't sound like you are memorizing from a book or something.
It's not like you should just come out "topics" randomly you
know?
Make it logical, like it's normal to ask such questions.
For example the bus thing, asking how she come, how many stops,
what bus number... so that next time if you are travelling there,
you know how and what is the bus route. Or even what buses does her
school's bus stop have.
It's nothing even about if she's interested in the topic or not.
There isn't a topic there in the first place. You're just asking a
question.