She reported that she heard the Prophet ﷺ reciting Surah al-Mursalat in the Maghrib prayer.
حدثنا سفيان بن عيينة عن الزهري عن عبيد الله
أنها سمعت النبي ﷺ يقرأ في المغرب بالمرسلات عرفا
Its chain of transmission is sahih. Bukhari narrated it, 2/246, no. 763, in the chapter on adhan, and Muslim, 1/338, no. 462, in the chapter on prayer, and it has already been mentioned many times.