How old was Sacagawea when Lewis and Clark kidnapped her?

Sacagawea was 16 or 17 when she and her husband, Toussaint Charbonneau, joined the Lewis and Clark party in the winter of 1804-05. (Her date of birth is uncertain.)
Sacagawea was about 17 when she began the expedition with Lewis and Clark. She also had a two month old son with her.