How to say in Czech: She speaks Japanese fluently.

English
speaks fluently.
Czech
Ona mluví plynně japonsky.
She speaks Japanese.
She speaks Japanese very well.
She speaks only a little Japanese.
Does she speak Japanese?
She does not speak Japanese.
She does not speak Japanese very well.
Does anybody here speak Japanese?
Is she Japanese?
Is she learning Japanese?
Is she learning Japanese on her own?

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