Interested in me or just being friendly?

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I don't consider myself particularly great looking, but this girl was.

Basically, I'm out having some drinks and I went out front for a cigarette by myself. I see this girl walking up to the bar entrance with her friends. Next thing I know, she's stood in front of me, asking me for a lighter, even though her friends are all smoking. So I give her a light. Next thing I know, she's firing all kinds of questions at me. If I'm having a good night, if this bar is any good, what my job is, what I study at university, and telling me a bit about herself.

Now, whenever a stranger strikes up a conversation with me my guard's usually up a bit, and as a guy who isn't particularly confident, especially so around an attractive woman. All the time I'm being "cool" and not appearing too keen (inside I'm nervous as ****!) but she's chatting away at me, touching me on the arm, looking me in the eye. The conversation ends when we both finish our cigarettes and I make a quick getaway.

Thoughts? Was she interested in me or just being friendly?