How to stop well-intentioned mom from adding stress?

Ta
My mom has been bursting to tell her neighbours about my pregnancy but so far, she's been really good as we have only told my husband's parents and not the rest of his family = I made it clear that his family should know before her randoms and she's been respectful of that 🙏🏻
Yesterday she started pushing for a baby shower and I seriously don't want one - how do I make her understand without being churlish? I just want to pass the rest of my pregnancy peacefully (we've struggled with fertility issues and this is will be our first child, a rainbow baby💕) and my mom gets too intense, super stressed and overwhelmed whenever she throws a party (for at least THREE months prior) and I just don't want to deal with that whilst pregnant, especially since I never wanted a baby shower. Advice on how to nip this in the bud while being kind & respectful to my well-meaning mom?