My boss harasses me

Hi, i need advice please. I'm 6 weeks with our first, after trying for years. We are so happy but just found out that my old boss is returning to the company. She was smart but a complete psycho. Every one else who worked under her had left. I was about to, then heard she was. Now that she is coming back, I'm worried the mental abuse will start again. My husband works at the same company too. She has made fun of him and me, she has kept me from a fair appraisal and increment. All that changed when she left. I've done well without her taking credit for my work, been promoted to manager, given charge of 4 teams..... but I'm so worried that she will thwart everything again. She is super manipulative and charming at the same time. More than anything, I'm worried i wont be able to control my thoughts and feelings, and I'm going to pass my stress on to my little one.