Barbara McGruer, of Trent Road, was one of 18 people taken to hospital after the crash on the B1040 near Bluntisham.
The 86-year-old died as a result of her injuries on Saturday, November 16.
Dozens of emergency services, including two air ambulances, were called to the junction with Bluntisham Heath Road on Thursday evening.
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The minibus, which was full of pensioners, had overturned after colliding with a VW Gold.
Margaret Henwood, who was 85 and from Foxlease, was pronounced dead at the scene.
One other minibus passenger remains in a critical condition while ten people remain in hospital with serious injuries.
The latter group include the driver of the VW, a man in his 70s.