Most Helpful Girl
I'd suggest you take a good look at her body language next time you're talking with her. It sometimes says more than words. :)
There are signs that she's interested - eye contact, feet turned towards you, her "accidentally" touching you or overall making the smallest physical contact.
However, the easiest and most honest way is to ask her out for a drink. It will save you a lot of time either if she's interested in you or not.0THIS IS NOT RELEVANT ANYMORE
Most Helpful Guy
It's not uncommon for a girl to laugh at your jokes out of interest.. even if it isn't much to go by.. But there's not much to tell apart from that, with just this little information. :30THIS IS NOT RELEVANT ANYMORE