Here's how:
* Jacquetta Woodville was the wife of Richard Woodville, and they had a daughter named Elizabeth Woodville.
* Elizabeth Woodville married King Edward IV, and they had a son named Edward V.
* Edward V was the King of England for a short period, but was declared illegitimate and imprisoned by his uncle, Richard III.
* Richard III was the last King of the House of York.
* Henry VII defeated Richard III at the Battle of Bosworth Field and became King of England, starting the House of Tudor.
* Henry VII married Elizabeth of York, daughter of Edward IV and Elizabeth Woodville.
* This union united the Houses of York and Lancaster, ending the Wars of the Roses.
Therefore, Elizabeth II is descended from Henry VII and Elizabeth of York, who in turn, were descended from Edward IV and Elizabeth Woodville, who were the children of Jacquetta Woodville.
However, it's important to note that Elizabeth II is not a direct descendant of Jacquetta Woodville through the male line. The direct line of descent from Jacquetta Woodville to Elizabeth II goes through her daughter Elizabeth Woodville, then her granddaughter Elizabeth of York.