@LimonViola
Good point snowagain. They did offer another room within the same city. If OP didn't feel up to driving due to tiredness she could have asked them to call her and pay for a taxi to it. It's still terrible to have double booked in the first place but OP had options it seems and chose to sleep in her car from what I can gather?
Yep that is what happened from what I can see.
Makes for a better story and garners more faux outrage from people if you embellish the story a bit though!. 
@montenotte
Simply put in a taxi... age 25 travelling alone... nice...
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limonviola
I don't get the relevance of being 25, that's someone who has been an adult for years 
Same here ... I know people as young as 18-20 who were backpacking around Europe alone. To suggest someone is being treated badly by being put into a taxi ALONE to travel somewhere, at the age of 25 is laughable to the extreme!
@montenotte
ODFOD
are you seriously telling me you were as confident/capable at 35 or 45 as you were at 25?
You know what, YOU can just FOD.
I was living alone in PARIS when I was 21. And I know many people (some as young as 18,) who travel alone, abroad AND within the UK, and live alone, and walk or cycle alone, Jesus fucking wept, what is WRONG with you?!
As I said, to suggest it is an appalling way to treat a 25 year old ADULT, because you have popped them into a taxi to 'travel on their own' is a fucking joke!
You need to try harder than that!