Learn what "then how did she know about it" means, when people say it, and how to use it naturally in English.

It means the speaker is questioning the source of someone's information.
From Help! I’m Falling In Love With My Rude CEO, Episode 33
The speaker is asking how a third person found out about the information.
Use this in an argument or investigation when you want to challenge how someone knew something. It is not a general standalone phrase for polite conversation.
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