Am I the narcissist or the victim? I’m not sure

There are so many things that go into this situation. So I’m sorry if this post becomes long. But anyways, my older sister and I haven’t talked for the last two years really because she was cheating on her husband and doing some other things that effected our relationship and I just didnt want to be around the drama anymore. So I silently cut her out for the most part. She was having a get together for my nieces birthday though and I was invited. I wanted to go to be there for my niece. Anyways, I have two younger sisters that live out of state and they were flying in for my nieces birthday. I made the mistake of saying something to my friend (who is related to my sisters in laws) about my younger sisters coming to see my niece for her birthday and then quickly found out that my sister had not invited anyone from her in laws side of the family. I didn’t know that was the case because they have been at every birthday my niece has had... So this turned into a huge dramatic thing and my older sister ended up sending message saying something along the lines of “I know we have our issues and you might be tempted to talk to people about me but you need to leave people out of my business” to which I replied with the screenshot of the conversation I had with my friend. The only mention of my sister or her family was “My sisters are coming because they want to see my niece for her birthday” and then she tells me “you said my daughters name in that text, that is my personal business”. I then tell her that she is skewing the situation because I was not sharing her personal business and I don’t want to come to the party anymore because I don’t want the drama... then she tells me I need to seek help because I’m a toxic person and will never change.. to which I replied and told her not to contact me anymore because she is changing the situation and seems to be projecting her mental health onto me when I had no idea she had not invited her in laws... She made me feel like I was crazy and now I question if I actually am? I’ve always wondered if she is narcissistic