Can a female doctor travel with a Hajj group, without a mahram?
Question

I know that a woman is not permitted to travel without a mahram. Last year I travelled with one of the Hajj groups with a mahram. This year I do not have a mahram who can travel with me, but the groups needs a female doctor to travel with them, and now there is no time for the group to find another doctor. Please advise me what to do, may Allah reward you.
Praise be to Allah.It is not permissible for a woman to travel without a mahram, even if she is travelling for the obligatory Hajj or obligatory ‘Umrah, because of the report narrated by al-Bukhari (1729) and Muslim (2391) from Ibn ‘Abbaas (may Allah be pleased with him) who said: The Prophet (peace and blessings of Allah be upon him) said: “No woman should travel except with a mahram, and no man should enter upon her unless there is a mahram with her.” A man said: “O Messenger of Allah, I want to go out on such and such a campaign, and my wife wants to go for Hajj.” He said: “Do Hajj with her.” 
With regard to the naafil Hajj, a woman is not allowed to travel for that without a mahram according to the majority of scholars, and some narrated that the scholars were unanimously agreed on this point. 
The fact that a group needs a female doctor to travel with them and that there is no time to look for another doctor, does not make it permissible for you to travel with them without a mahram. How can a person draw closer to his Lord by doing Hajj or helping others by means of disobedience? 
We ask Allah to guide you and make you steadfast. 
And Allah knows best.