Mother in law

My mother in law feels entitled to everything. I am not big on taking pictures or social media, and she’s the opposite. She’s an attention seeker, she’s the kind of person who checks her self into the hospital on Facebook. She feels that she needs to be updated on everything during MY pregnancy. She texts me everyday asking for baby bump pictures. I don’t even have one yet but she keeps asking. She said she needed to be the first one to know when i get pregnant, she needs to be the first to know about the gender and be there for the birth. She’s making it to the point where i don’t want to update her at all. She is ruining this experience for me. She already went through 3 pregnancies i don’t know why she’s trying to live through mine. Any advice on how to get her to back off?