The collision happened on the B3277 near Chiverton Cross in Cornwall at about 13:30 on Monday.
The woman, who was driving a Vauxhall Astra, was pronounced dead at the scene. Her next of kin have been informed.
The driver of the other vehicle, a 59-year-old man from Doncaster in a Mazda MX5, sustained serious leg injury and is being treated in hospital in Plymouth. His passenger, a 50-year-old local man, was treated at the Royal Cornwall Hospital near Truro for minor injuries.
Officers closed the road between Sevenmilestone and Chiverton Cross for seven hours for an investigation.
A bus strike which was due to take place in South Yorkshire on Saturday will not now take place as a mark of respect for Armed Forces Day, according to the union representing some workers.
Unite members who are employed by First South Yorkshire previously voted to strike in a dispute over pay.
While Saturday's planned strike is suspended, a 24-hour strike is still due to take place on Monday 1 July, according to Unite.
Talks about pay are ongoing between the company and the union, with about 900 bus drivers set to strike, a Unite spokesperson added.
We recognised that a strike on Saturday would cause severe inconvenience to veterans wishing to attend events across South Yorkshire. Our dispute is with First South Yorkshire and not with current and past members of the armed forces who have bravely served their country."
Sir Gary Verity resignation: Investigation updates due
Updates on two investigations into Welcome to Yorkshire are due to be given to a meeting of the tourism organisation's board later.
Yorkshire MEP hits out at Rees-Mogg over EU iPad tweets
A Yorkshire MEP has hit out at a newly-elected MEP after she described a free iPad she was given as part of her new role as an example of "the corrupt gravy train" of the EU.
Annunziata Rees-Mogg, a Brexit MEP for the East Midlands and sister of Conservative MP Jacob, posted on Twitter about the "shiny new iPad I was given by the European Parliament for no very obvious reason".
Responding, Labour MEP Richard Corbett said she wanted to "rubbish everything about the EU, even when you know the truth.
"The Parliament gives you an iPad configured to parliamentary work, so you don’t need so many paper documents, saving money and trees, and can work more effectively," he added.
Transport investment needed as northern services decline
Northern mayors and council leaders want more investment in transport after figures showed train services have got worse, despite the push of a Northern Powerhouse.
Cities like Leeds, Sheffield and Hull were encouraged to work together both in rivalling London and the South East and to "take on the world", with more jobs and opportunities.
But five years on, doubt has been cast on just how successful the project has been, with transport being one key area that officials want to improve.
The number of cancelled and significantly late trains on TransPennine Express and Northern franchises more than doubled from 20,000 in 2014-15 to 47,000 in 2018-19. It meant that almost one in every 20 services was either cancelled or more than 30 minutes late arriving at its destination.
Mayor of the Sheffield City Region Dan Jarvis, said the government should see the north as "an asset, not a liability" and said Westminster had "let the north down".
Judith Blake, leader of Leeds City Council, said: "The northern authorities are working much more closely together and that's a real benefit.
"The real difficulty we have is that (transport) schemes are delayed and there's a real lack of commitment to rebalancing the economy."
Watch: Friday's weather forecast
Weather Presenter, BBC Look North
Today will be mostly dry but we could see one or two isolated showers.
Temperatures will reach up to 19C in places:
Yorkshire's weather: Fine and dry
It will remain dry and fine with a good deal of sunshine today, and just a little patchy cloud forming. Highs of 17C (63F).
Dry tonight with largely clear skies and one or two mist patches.
Check your Yorkshire train journey
BBC News Travel
If you're making a journey on the rails in Yorkshire this Monday morning, most services appear to be running to time so far, however:
The 07:38 service from York to Middlesbrough running 27 minutes late
The 07:58 service from Bradford Interchange to Leeds is running 10 minutes late
For all the latest live updates from the county's main railway stations, click on the links below: