According to this current post, she led a team that discovered an extremophile bacterium called GFAJ-1 in California's Mono Lake.
Mono Lake is naturally rich in arsenic.
The team claims that the bacterium uses arsenic for a small amount of phosphate in its DNA and some essential biomolecules.
I heard this story Study Of Arsenic-Eating Microbe Finds Doubters on NPR.
It seems that some scientists disagree with the claim made by Ms. Wolfe-Simon's team regarding GFAJ-1 in research article A Bacterium That Can Grow by Using Arsenic Instead of Phosphorus.
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