Malik said, concerning a woman who had never been on hajj, "Ifshe doesn't have a mahram, or if she has, but he cannot come with her,she does not abandon Allah's making of the hajj obligatory for her.Let her go in a group of women." Translation Not Available

Book Ref: Muwatta Imam Malik Book 20 Hadith 263
Web Ref:  Muwatta Imam Malik Book 20 Hadith 263