Would you email your boss or go into the office and talk to your boss about some issues you were having?

My co-workers and I are having some really tough issues concerning another co-worker we are having to deal with. She's very controlling and wants to run everything in the facility but she has no authority so she takes it upon herself to put herself in control. The situation is VERY noticeable in all departments and there are individuals that are at the "brink" of whipping her @ss. The team leaders know all about what's going on but are afraid of taking action because they feel that they are putting their jobs at risk and hopes (thinks) that her behavior will eventually subside. So, by me being me, I'm never afraid to voice my opinion or bring things to my superiors attention. So, should I email the boss or go to the office?