Was this flirting or implying anything beyond playfulness?

I was in a college group project with a woman. She’d done a drawing of what we were doing, but it wasn’t required. She joked that it might give us extra marks. We then talked about another group, and I jokingly asked her if they’d done a drawing as well. She smiled back and said “I don’t think they did” in a playful tone while shaking/wiggling her hips for a second or two. Could this movement have been subtle flirting? Or was it just playfulness/engaging in the conversation?

Was this flirting or implying anything beyond playfulness?
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