Probably a REALLLLY stupid question but I'm dumb when it comes to women, what does it mean when?

A girl starts a convo with you, and she's never met you before, not only in person, but, online. She just randomly messages you, and tries starting a convo. It didn't really go anywhere once she did, but, from my understanding is that it is UNCOMMON for a woman, to approach a man, first

Probably a REALLLLY stupid question but I'm dumb when it comes to women, what does it mean when?
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