The majority position, based on the Prophet's ﷺ guidance that a woman should travel with a mahram, is that she performs Hajj accompanied by one. Some contemporary scholars permit travel within a safe, trustworthy group; a woman should follow qualified scholarly guidance for her situation.
References
Sahih al-Bukhari 1862
Informational, not a personal fatwa. Consult a qualified scholar for rulings on your situation.