She never saw the Prophet (ﷺ) fasting the whole month except Sha'ban which he combined with Ramadan.
Sunan Abi Dawud Book 14, Hadith 24
← Previous Hadith The Messenger of Allah (ﷺ) as saying: Do not fast one day or two days just before Ramadan, except in the case of a man who has been in the habit of observing the particular fast, for he may fast on that day.

Sunan Abi Dawud Book 14, Hadith 23 Next Hadith → AbdulAziz ibn Muhammad said: Abbad ibn Kathir came to Medina and went to the assembly of al-Ala'. He caught hold of his hand and made him stand and said: O Allah, he narrates a tradition from his father on the authority of AbuHurayrah who reported the Messenger of Allah (ﷺ) as saying: When the middle of Sha'ban comes, do not fast. Al-Ala' said: O Allah, my father narrated this tradition on the authority of AbuHurayrah from the Prophet (ﷺ)

Sunan Abi Dawud Book 14, Hadith 25