Sister announced birth on Facebook 🙃

I should preface: I have asked several times throughout my pregnancy that others not share my news online. I’m not on FB and my circle is very small on Instagram. My sister has been told (repeatedly) to not share things on FB. She is big into her social media accounts….

I have since learned second hand that she has taken the liberty of announcing my daughters birth online since it “was social media official” after I posted her arrival to my Instagram page.

How do I approach this without sounding like a psycho??? I get and understand that she is excited but this is not her news to share, especially considering I have shared my feelings about this already.