A Woman May not Travel Except With a Mahram
Question :
What is the ruling of the Islamic Law on a female servant traveling without a Mahram. Is it her coming from her country without a Mahram that is forbidden, or her presence in the house in which she is serving alone, without a Mahram?
Answer:
It is not permissible for a woman to travel without a Mahram, whether she is a servant or anything else, because the Prophet SAW said:
"A woman may not travel without a Mahram."
As for her presence in the house, she does not require a Mahram, but it is not allowed for a man who is not related to her to be alone with her, because the Prophet SAW said:
"A man may not be secluded with a woman except with a Mahram."And he said:
"A man should not be alone with a woman, for verily Satan makes a third."
Narrated by Imam Ahmad with an authentic chain of narrators, on the authority of 'Umar, may Allah be pleased with him.
Source:
Ibn Baz
Fatawa Islamiyah, Vol. 5 Pages 123-124