What special contribution did Sacagawea make to the Lewis and Clark expedition?

Sacagawea was invaluable as a guide in the region of her birth, near the Three Forks of the Missouri, and as a interpreter between the expedition and her tribe when the expedition reached that area. She also quieted the fears of other Native Americans, for no war party traveled with a woman and a small baby (her son Jean-Baptiste Charbonneau). She also showed them various new plants and tricks for surviving in the wilderness.