Do you have her email ? Or any form of text messaging contact
?
Just send her this.
Hi ( Insert name),
Thank you for the interesting chat we had the other day. You seem
like a very friendly and nice person. It will be nice if I can know
you better as a friend. Hope to chat with you again soon.
( Insert Name )
If she replies you replies with a thank you note on the
compliments.
Good.
If not, forget it, she is not interested.
If she replies, ask her out for a lunch or other group
activities.
Keep it informal, keep it casual. Remember U are not out for the
kill.
All you want to do is to get to know her more.