What does it mean when a girl giggles after the conversation?

I know when a girl giggles WHILE you talking so probably likes you but is it different when she giggles after the conversation.

Like when the conversation ends and just before you walk away she giggles

I'm assuming that in her head she's probably thinking ha ha he likes me but I don't really like him
What does it mean when a girl giggles after the conversation?
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