I personally believe that if you do not advocate to the fullest for your client because of politics, that you would be committing malpractice. It might feel like a tough spot to be in, but you have a job to do.
Lawyers pull these kind of moves all the time, especially with younger attorneys, and they will respect you if you challenge them when they pull moves. Since she is going to be a judge that you are going to be practicing in front of for a long while, it behooves you to present yourself as a competent attorney right now.
Draft your motion and bring the emails with you.
Since you put that part in about the DUI, I will tell you that trying cases, and trying them hard, will lead to prosecutors giving you better offers down the road. Just like the soon-to-be-judge, a prosecutor will respect you more if you come right at them. On the flip-side, as a defense attorney, I did not have a lot of respect for prosecutors that routinely gave low offers. Be aggressive and have fun with it!