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

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

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