The Wikipedia says the following about the death of Pocahantas:
In March 1617, Rolfe and Pocahontas boarded a ship to return to
Virginia; the ship had only sailed as far as Gravesend on the river
Thames when Pocahontas became gravely ill. She was taken ashore and
died in John Rolfe's arms at the age of twenty-two. It is not known
what caused her death, but theories range from smallpox, pneumonia, or
tuberculosis, to her having been poisoned.
It seems strange that she should die so suddenly at so young an age and at a critical juncture, no less. She died shortly after discovering that John Smith was alive. Is there any additional information that is more definitive about the way she died?