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

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

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