How to deal with a controlling person?
Keep a neutral gaze, expression and tone of voice when speaking with them. Don't let your emotions get the best of you. Make it clear that you're committed to working with them, but let them know your boundaries and that they're non-negotiable.
How do you work with controlling people?
A controlling person can thrive on undermining others, so prepare yourself for aggressive replies. Keep your responses professional. The less you react, the more you'll be able to exercise sound judgment: you don't have control over her behavior, but you can control yours. Believe in what you say, too.