We traveled in our personal cab for our entire journey in Bhutan. You can visit Dochula pass on the way.

May would be quite cold and most of the passes are snow clad with limited accessibility. best months to visit would be July-Aug

I was told not to come in July and August 'cause there are huge monsoon rains (that even destroyed - simply removed . many roads). I was in begining of January and it was OK. They told me perfect is in March and April.

It is accessible by cars

Hey I don't see any issues for her to travel as the climate is cool, air quality is very pure and food is organic!! In fact she will love the place!!

Thank very much tour question sir.yes september month is a very best season to visit Bhutan where you will have a best weather to have beautiful of eastern himlaya feon dochola pass.its not cols and not hot its a right time.

I was in Bhutan two months ago ( Oct ) and the weather was perfect. A light jacket in the morning and evening and the afternoon was glorious.

November last week might be on a much colder side as winter starts from November to Feb/March..For any traveler be it male or female no place is as safe as Bhutan! I am really fond of Bhutan after being there! Cheapest way I feel will be train to Bagdogra and from Bagdogra by road to Phuentsholing,Bhutan! Travelling by road from Bagdogra to Phuentsholing would be scenic during September-October as it will be post monsoons! I had taken flight from Mumbai-Kolkata and Kolkata to Paro! Return ticket cost was approx 24k INR per pax.

Bhutan is completely safe to travel for SOlo travelers

climate in second week of March will be cold but pleasant! I had traveled from 13th to 20th March and absolutely loved the climate! Punakha was around 15 degrees but Thimpu and Paro were cold around single digit temperature! We were lucky to receive fresh snowfall while descending from Tiger's Nest!