Should I let my MIL tell everyone?

A little back story. We lost a baby a year ago at 20 weeks, and it was very traumatic and I feel like we both still hold a lot of trauma even now. I’m currently 20 weeks pregnant again and we have decided this time that we don’t want to tell anyone except immediate family and very close friends (and obviously my work since I’m clearly pregnant at this point)

We have expressed this to our families as I have no intention of posting anything publicly on social media, possibly not until our baby girl is born safe.

My MIL has now messaged me 3 times and asked me in person twice if she can tell everyone in her family. We’ve already said no, and that if we feel comfortable at some point we’ll let her know. She messaged me again today asking, I haven’t responded because I don’t know how to say no for the 6th time without sounding rude that we don’t want that. I can tell she’s getting frustrated with me, and I’m starting to feel defeated like maybe I’m being silly not letting her share the news.

Should I let her tell everyone? Am I being ridiculous wanting to keep our bubble small this time? AITA?