MIL advice!

I just need some advice! I’m 6 weeks pregnant we just found out a little over a week ago. Very much unplanned, my boyfriend told his mom and asked her to keep things private as I’m only 6 weeks. We are both very private and hardly post on social media anyways so I had no plans of announcing my pregnancy to the internet. She immediately posted it within 2 days of finding out and after 100s of comments is refusing to delete her post.

I don’t know how to go about this the right way.