Mom & MIL Drama

Super long post....

So I’m not exactly sure when this all started. I’m currently 27 weeks pregnant and I had asked my MIL if she would like to plan our baby shower as I no longer feel up to plan anything since it stresses me out. She said yes that she was already planning on doing the shower and getting my SIL to help with me. I let my mom know when she asked when the shower will be. Few days later, my sister told me that my mom was really mad and disappointed that I had asked my MIL to plan our shower instead of her. She told my sister that she should be planning the shower since I’m her daughter and that my MIL has her own daughter she can throw a shower for(my sister is not having kids at all, so I’m the only one that will be having kids) I told my sister that I only asked my MIL to throw the shower because their house is much bigger, it’ll be all of my husbands family that is invited since our family only consists of my mom, her boyfriend, my sister and me... I also mentioned it was better for them to spend the money on the shower since they have more money and that way they can just get gifts and not worry about not having enough money for the shower and a gift. She told me that that’s what she told her but she was still upset. Now anytime we do anything, in order for my mom to decide if she wants to be part of it is if she knows that my MIL will be there. Like for 4th of July, I asked my mom if she wanted to come with us to see fireworks(didn’t tell her anyone else was coming yet) and she said no because of the crowds. I asked my sister if she wanted to go and she said no. So we asked our in laws if they wanted to come and they said yes... next day, my sister tells me that my mom was like “they went together and she didn’t even invite me!” 🙄 same when I asked my mom if she wanted to be in the delivery room when the time comes, she said no that she will be in the waiting area until baby comes out. Few days later, my sister told me that my mom was saying if my MIL is in the room with me, that she’ll go in the room too. 😡🙄 I know for a fact that my MIL wants to be in the room the whole time. We decided to let people come in and out of the room until it’s time to push, but now after the 4th of July thing, I’m really considering not calling anyone until baby is here. But then I’m worried that if my in laws get there before her, that she’ll end up saying something like “she didn’t even call me first!” I’m technically not supposed to know any of this... I just don’t know what to do! It’s so frustrating and childish.. should I say something to her or just let her deal with it?