Here's what we know:
* Native languages: Sacagawea was a member of the Lemhi Shoshone tribe, so she would have spoken their language fluently. She also likely spoke some Hidatsa, the language of the tribe she lived with after being kidnapped.
* Trade languages: It's probable she had some understanding of Chinook Jargon, a trade language used across the Pacific Northwest.
* French: Sacagawea's husband, Toussaint Charbonneau, was a French-Canadian, so she likely learned some French from him.
However, there's no reliable evidence that she was multilingual in the way often portrayed. The number 8-9 languages is a popular exaggeration that has been perpetuated through folklore and popular media.
It's important to remember that Sacagawea's story is complex and her impact on the Lewis and Clark Expedition was significant, even without the romanticized language skills.