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

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

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