The default ruling of the Sunnah is that a woman does not undertake a journey except in the company of a mahram (husband or a close male relative she can never marry), based on the explicit command of the Prophet ﷺ. He said, "It is not permissible for a woman who believes in Allah and the Last Day to travel for a distance of one day and night except with a mahram." This is a protection for her, not a restriction on her worth. There is legitimate ikhtilāf among the scholars over some specifics — such as the minimum distance counted as "travel" and whether a trustworthy group of women suffices for the obligatory Hajj — but the general principle of the mahram for travel is firmly established.
Evidence — the daleel
Sahih al-Bukhari 1088 ṢaḥīḥSahih Muslim 1339 Ṣaḥīḥ
On deen2u
Informational, not a personal fatwa. Consult a qualified scholar for rulings on your situation.