Apparently Plame's cover job for her covert activities was her position at Langley CIA headquarters. No other 'cover' has been put forth. Even Maxwell Smart would have had a better cover job than this.
"Who me, a spy? Why do you think that, I just work at the CIA. Excuse me. I have to answer my shoe."
"No other 'cover' has been put forth."
First, no one is really spending much time talking about the details of her cover, for good reason.
Second, I guess you've never heard of Brewster Jennings? You know, the CIA front company that was her 'employer'? The one that also 'employed' other agents who were no longer covert after Plame's status was publicized?