How to say in Czech: How good is her Czech?

English
How good is
Czech
Jak dobře umí česky?
Her Czech is getting better.
Her Czech is very good.
Her native language is Czech.
Is she learning Czech on her own?
How do you say that in Czech?
I do not speak Czech very well.
You speak Czech very well.
Czech is a difficult language.
Czech is difficult.
He is Czech.

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