MIL Blow Up

So after giving it much thought, I decided I'd like my sister, mom, and step-mom to throw the baby shower and my MIL to throw a "Sip and See". (They both offered to throw showers) This is mainly because my MIL completely took over the bridal shower, leaving my family with nothing to do to help out. I stupidly thought that this baby shower solution would be an OK decision, but she completely blew up when I told her this, basically allowing me to see what she really thinks of me. Her family has all been through the ringer with her, so she knows how irrational she is, and so do I from previous arguments we have had, but tonight was so much worse. Probably due to added hormones. The things she said, though, were inexcusable and very hurtful. I'm now worried that she may make the rest of my pregnancy very stressful. Before we got pregnant, I was finally in a place where I spend significantly less time around her because of her negative behavior, but now I'm not sure with a little one on the way. I guess the point of this post was to vent and also see what your opinions are for family stress relief. I don't need this anxiety or high blood pressure right now! Please give me your advice, and thanks in advance!!