She rejected me but still flirts?

I asked out this girl after she broke up with her boyfriend. She didn't say "no" outright, but from what I could tell she was letting me down by saying we should go out as a group. Well, after that I didn't see or talk to her for a couple weeks, and then the next time she saw me, she came up to me and began flirting with me the way she used to do. And then when I flirted with other girls in front of her, she was watching me and at the end made a comment about one of them.

Is there any point in asking her out again? Or does this mean nothing? And if she does have a little interest, wouldn't it be up to her now to do something since I already tried once?
She rejected me but still flirts?
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