Forget the marriage for a minute, that part depends totally on the marriage itself. Just on her, the reward for doing the right thing is getting punished slightly less? Maybe? I don't even think that the SEC would be able to make a good case against her if she simply plead the 5th on the stand. She didn't profit and had no involvement with the crime itself.

And besides, her doing the right thing solely benefits BP here. It looks like just a large corporation using someone who actually cares about them and then throwing them away. Why should future people in the same position ally themselves with a known defector?