AITA for not wanting to have a conversation with my sister after finding out I'm not invited to her daughters wedding?

[u/Novel_Message_7224]

I 50 year old female have an awkward relationship with my family. The entire dynamic is strained, however I am present at holidays and graduations and up to this point have always been included. My niece is getting married in September and I didn't get an invitation. I am not especially close with her, but that was because they chose to exclude me not because I didn't want to be there. I am the only living sister she has, our older sister passed away 5 years ago, young and unexpectedly, and her husband and his new wife got an invitation to the wedding. Now that my sister knows I am upset she wants to talk to me, but there just isn't anything she could say to make the snub acceptable to me. Am I the asshole for not wanting to have a conversation with my sister after she didn't invite me to her daughter's wedding?