Technically she wasn't a Jedi anymore. She was exiled. So was our Exile. Bastila is the last "oficially-sanctioned" Jedi left. And Atris, of course, if she's still alive. Remember, this is on the Republic ship orbiting Telos after the battle on the Ravager.
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The "she" I was referring to in the first sentence was Kreia (an elder Jedi), not Bastila. Bastila was the only "official" Jedi left. Not the Exile. The Exile was never reinstated because there's no Council to reinstate him.