Hate to be the negative nancy here, but I don't think you can determine if she likes you from just that, she may just be having a good giggle at how awkward you are around her and may be sharing that with her friends, just because they're talking about you doesn't mean its necessarily all lovey dovey "oh I hope he asks me out one day *swoon*" stuff.
But! If you like her, go for it. See if you can overcome the anxiety when you speak to her and when you feel a bit more relaxed around her, ask her out for a drink or meal and some bowling or a movie or whatever.