If I wanted to put an outdated Indian stereotype in the game, I would have named her "Girl That Pisses Herself," gave her red skin, and have her sell cigarettes outside the store.
Tewau was inspired by my interest in Indian culture and society, and I planned on expanding on it more before I cut down a lot of the game's scope-creep. My belief is that the Indian culture that we know of is based off the survivors of a cataclysm that destroyed their entire society, and they were left as a People that was surrounded by old, "ancient" technology, and so I tried to adapt that into her character. Check out Lewis & Clark's journals if you ever get the chance, and you'll see what I mean and why I made the decisions I did.