Hadith.2911 - In a narration from Hisham, from Sulayman ibn Khalid, from Abu Abdullah عليه السلام, regarding a woman who wants to perform Hajj but does not have a mahram (close male relative), he عليه السلام was asked: "Is it permissible for her to perform Hajj?"
Imam عليه السلام said: "Yes, if she is trustworthy."