"How well do you know her?"

Translation: Jak dobře ji znáte?

[pavlovnia]

'Jak dobře znáš ji' - please, explain what is wrong here?

[Jamie08MD]

The "ji" is a clitic, so it has to be the second element in this sentence. The first one is "jak dobře - how well". Jak dobře ji znáš?

[pavlovnia]

Thank you very much!

[dulejr]

Can kolik be used instead of jak?

[VladaFu]

Not really. You are asking about the quality of the "knowing". Not for any specific measure.