"Lekarz powiedział, że ona musi wziąć ten lek."

Translation: The doctor said that she has to take this medicine.

[idanlipin]

Why she had to?
Isn't it has?

[Jellei]

Well, it is caused by the sequence of tenses in English... but in fact we learned that it is not absolutely necessary in English, it depends on the interpretation. So let's put "has" in the main answer, it's a lot less confusing.

[alisa488338]

We have no rights to change grammatical rules in the English language ( the sequence Tenses)/ That`s it!

[one_half_3544]

"a doctor has said, that she must take this drug"? marked as wrong..

[Jellei]

Although it probably was some more specific doctor, okay, it should work, so added now.

[WaFeKiS]

Why not: "The physician said that she must take this medicine." ?

[Jellei]

Added "physician".

[DavidBowma14]

Audio should be "lek" at the end of the sentence, not "lekarz"

[Jellei]

Yes, definitely... I removed this sentence and created another one which has "jutro" after "lek", I think there's a chance that not having "lek" at the end may make the TTS pronounce it correctly (the audio has not generated yet at the moment when I'm writing this).