What are signs a girl is nervous and socially awkward, vs just playing games?

What are signs a girl is nervous and socially awkward, vs just playing games?
Sometimes girls seem interested but very inconsistent, and it’s hard to tell if she is shy and nervous, or just playing games and toying with a guy. And it’s easy to assume a shy girl as a game player, and dismiss her. What are signs a girl is nervous and socially awkward, vs just playing games?
What are signs a girl is nervous and socially awkward, vs just playing games?
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