Original text - Polish - Monka, jak będziesz mogła rozmawiać...

Lack of Polish letters and punctuation.
The text should be typed in this way:

"Monka, jak będziesz mogła rozmawiać, to zadzwoń. Ważne(To jest ważne)".

Thanks Aneta Corrected!

Is "(To jest ważne)" also supposed to be in the request

"Ważne" it is just a mental leap. The whole meaning of the word is "This is important/urgent" (To jest ważne). Anyway you can skip the whole phrase of course. After all we have another verb in the text.