Help!! Feeling discouraged

Okay guys. Things have been brewing with my MIL for about a year. She lives in a whole different state but she tries to control my husband and thinks he’s still a little boy. She comes and visits us for a month at a time and doesn’t even ask if it’s okay. She just tells us the dates she’s coming. I haven’t said anything because I don’t want to cause drama. Backstory: my husband’s parents are divorced and have been for about 10 years. It was an ugly divorce and she bad mouths him any chance she gets. She also has two other children from a previous marriage who are in their 40s who went no contact with her. She has 7 grandchildren she has never met and it has made her go insane.

Fast forward to this year: My husband and I got married in June. She was completely unhinged that day and made it all about her. She rearranged all the place cards at each table because she knew better than my planner about who needed to sit where. When confronted by my planner, her husband yelled at my planner and made her cry. She also humiliated my FILs wife and told everyone that her underwear was hanging out as a “joke”. Next, I found out i am pregnant and due this spring. All she talks about is how amazing she’ll be as a grandma. On Christmas I sent her some maternity photos and her response was that she was going to post them on social media since I was taking too long to post my announcement. I begged her not to and she laughed at my message. That brings us to last week during Christmas. My FIL came to visit and we opened gifts. To my delight, he gifted us a pair of my husband’s baby shoes. It was so special. I texted her a picture of my husband holding the shoes because I want to include her. She was ENRAGED. She said she had been looking for those shoes and she bought them. She was upset because she wanted to give them to us. I never responded. Yesterday I posted about 20 photos recapping the year and my FIL was in one of the photos. She was in any. She comments “hmmm” on my post. I text her in a group chat with my husband and ask what the problem is. She said she wasn’t in any photos big my FIL was and it hurt her. She added “I try to be a good mom.” I texted back it was not intentional but I am not participating in this drama and just because I didn’t post her doesn’t mean she’s a bad mom. My husband and I had an extensive talk about all of this and he agreed to text her. He said it’s not a competition among other things. I could tell he was really irritated to text her because he didn’t want to stir the pot with her coming to visit us so soon and that hurt me. She sent back a long snarky reply. Has anyone dealt with something similar that can give some advice? I do not want a competition among grandparents once my son is born. I truly think she’s narcissistic and don’t know what to do

Looking for advice and encouragement ❤️