Okay so I feel I am a bit in a pickle here. I will have to keep some details vague as they might make people very identifiable. We all are involved in a sector dealing with specific animals. This happened about 2 weeks ago A bit of prestory - me and my family had a family friend called "Maria". She was a wonderful woman, who loved animals and used to run her own animal rescue. She would always put animals needs first and would teach others around her to love them and treat them with respect. Unfortunately she has passed away from cancer around 10 years ago. The animal rescue is now in a hands of her daughter, "Anna" (late 40s f)who cares more about profits then animals. She is also incredibly religious and a lot of people I know, including me, stopped helping her with the rescue due to her constantly annoying others with questions about having kids as well as being rude to someone else because they adopted. Her son is incredibly spoiled by her and constantly whines at the age of 22, while also behaving entitled. Due to this I haven't spoken to her for years and keep conversations to a minimum. Now to the actual bit - I (30s f) was visiting family when a common friend invited me and Anna with her son to a tribute to Maria to mark the anniversary of her passing. The said friend has booked the tickets so we can pay tributes in a place that meant a lot to Maria. But it also meant I would be stuck on a plane with Anna for 8+ hours on the way there. The plan was flying to the place, meeting my partner there and after the tribute me and my partner would spend the rest of the holiday in the country before flying home (I moved to a completely different country to where my family is). I am gonna be honest I didn't expect to have a seat booked next to Anna and her kid and after a short journey to the airport I had enough of them. So I found a single traveller and asked if they would mind swapping seats with me. I knew Anna wouldn't disturb the passenger because while she knows english she chooses not to speak it. The stranger agreed so I spent the rest of the flight in peace. (I hope the stranger was okay too). After the tribute Anna called me an asshole and said she needed help and feels I have betrayed her and Maria's memories as we could have spent the time on the plane preparing for the tribute. I have told her that her behaviour to the airport where she was grilling me about not having kids made me uncomfortable as well as her attitude towards something her mum loved and cherished. She took it personally and doubled down.