My theory....
.... Kalinda goes to prison. I bet it comes out that she faked the email. The detective produces his outlook calandar, showing that he couldn't have read the email, as he was on holiday, visiting sick aunt gertude in Outer Mongolia, where the wifi doesn't work. Kalinda has to fess up.
I think the bishop thing is a red herring. I've never understood why Kalinda, who is supposed to be oh so street smart, canny and resourceful managed to get into the situation she is with Bishop. Given her line of work, she more than anyone else would have known how dangerous he is and would have steered clear.
My first thought is that she would have done a runner - it fits in with her character (secret past, mysterious, no reason to hang around). This wouldn't make good TV, which is why I thin prison. They couldn't kill her off, as they did this with Will and it's too soon after her death.
Just had a thought - if Alicia wins the states attourney role, she'll be in charge of putting Kalinda away. What a brilliant storyline that would be . I think I should write for the show, I'm on a roll.