Mother daughter issues

So I need some objectives views on the current issues I'm having with my mother. I'll try to be as concise as possible.

Sunday my mother suggested going to eat at city island and I agreed. It was my SO, 15 month old son, grandfather and little sister. She drove to the end to eat at Tony's Pier. It was very crowded, very messy, kind of like a seafood fast food. The lines were also very long. My SO suggested we go eat at one of the restaurants being that our son likes to run around and pick up everything of the floor etc. She refused without explaination. So we decided to go sit down at a restaurant figuring we'd get quick service and be done about the same time. After we get back my mom makes comments that I can't recall but I simply said at least we all ate peacefully. And she went off!

Fast forward to today. We had long planned a family night at my job were everyone brings friends and family and watch a chosen kids movie. My sons favorite this year, Moana. Although I hadn't spoken to my mother I assumed she was still coming. Well she didnt. She send me a text saying I should have swallowed my pride and called to apologize. My father explains to me that my mother used to go to Tony's Pier with her mom and she wanted to reminisce. Well I NOW understand and can empathize but now she's purposely wronged me and my son. I tried to tell her my pov. How I didn't realize why it was a big deal and she still continues to attack me. Ending her text by saying I shouldn't have the honor of calling her mom and should talk again.

Am I wrong to think she's being childish at this point? My father wanted us to make piece but she makes it impossible.

Can anyone offer some advice?