What role did Pocahontas play in the settlement of Jamestown?

None. The story about her is a fable and not true. It comes from Smith who lied in his book and made himself seem more important than he was. Pocahontas was dead when his book was published so she couldn't refute his story. When Jamestown was settled in 1607 they arrived in an Native American empire of 14,000 people and built their fort on the worse land in the area. She was 10 or 12 years old when they arrived and her father was chief. She was kidnapped by the settlers held for 4'years, became a Christian, and changed her name to Rebecca. While she was held captive she met and married John Rolfe. The couple left for England, she had a baby boy, and died soon after . Her grave is in England.