In this case the signs could have meant ANYTHING, you haven't given me or anyone here enough to do much. All you have done is show low self-confidence (

start working on this immediately for yourself you'll enjoy yourself so much more). You need to stop thinking of what she is doing and actually witness what she is showing you. She did stick around for 15 seconds, all you had to do is get a conversation going. Sticking around for 15 seconds is actually a long time by yourself and she could have been sending you what is sometimes referred to as a sexual overture. Look at proxemics and her foot work especially where was her foot pointing? It normally points at the most interesting thing/person.
IOIs are a horrible way to read a woman's attraction, body language must have all of the signs go through the body language guidelines before drawing a conclusion. One type of woman may give small signs of interest purely based off of personality, it is up to you to read all of her body language not just a couple of signs and say oh she is interested. You must read and react, you must be the properly responsive man, not create a stop light system. You can tell a genuine attraction if you just learn the basics of reading attraction, and then you learn to gauge how strong an attraction is.
Learn to read body language, that is "the key to natural game is body language", reading body language, there is a thread on this page I authored you can read it if you'd like.
I also have a video series in my sig (Does She Like Me? Show -
www.doesshelikemeshow.com) I need to upload more videos but I have a bunch of videos on reading body language attraction ques, it starts with body language guidelines which is key because so many people miss the truth about IOIs which is that some signals aren't always positive. It has some example clips and pics, hopefully that helps I poured a lot of work into it.
If you need more ask away I just think that should be plenty for you.
Peace and Love,
Vic
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Just another guy from back in the day.
Blogging again living life:
http://www.Scienceofnaturalgame.com