Dancing around all alone
She’s so in love right now, but he’s not (or she doesn’t know) so that’s why she’s dancing alone.
Also, she may have been captivated by this man, however he does not truly know her as she thinks she knows him. Her immediate feelings of love are comparable to love at first sight although she is probably just feeling lust.
The word “wonderstruck” further evinces that she has not developed these enchanting feelings after having known this man for so long, but rather she was “struck” by him and immediately felt in love with him.
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