"What is new, Sarah?"
Translation:ما ٱلْأَخْبار يا سارة؟
İ think because you are asking about a specific thing.... However, there is a big chance that there is a more deep complicated explanation within arabic grammar rules... But i think it is not known for most native speakers either.... What you can be sure about the name after ما in a question should always be definite either by putting ال to it or by adding it to another definite word