From Sahih Bukhari (Hadith 2784):
Narrated `Aisha:(That she said), "O Allah's Messenger (ﷺ)! We consider Jihad as the best deed. Should we not fight in Allah's Cause?" He said, "The best Jihad (for women) is Hajj-Mabrur (i.e. Hajj which is done according to the Prophet's tradition and is accepted by Allah)
Reference: Bukhari 2784