A girl is very flirty with everyone but me. Should I take this as a good or as a bad sign?

In my social circle, there is a girl who is very flirty with pretty much every guy. She touches, makes spicy jokes and suggestive comments, her body posture is totally open, etc. It feels like this is her standard behavior.

BUT, when she is talking to me alone, she is much meeker and usually behaves more discretly, with much closed body posture. If we are in a group, she is a bit bolder, but not so much. When we interact, she sometimes alternates between being friendly, nonchalant and passive-agressive.

Some of my friends say that this is a sign of interest. Others, that she is shutting me down before I even tried something. I don't know what think, to be honest.

A girl is very flirty with everyone but me. Should I take this as a good or as a bad sign?
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