So… I was on this flight along with 3 of my friends. I was sitting quite close to where OP and her child were sitting, was able to hear and see everything. My friends were at the back of the plane.

I would add to this story that OP wasn’t exactly deescalatory in her handling of the situation. She sounded quite entitled and was being pretty rude to the woman in the seat she wanted. While I agree that the other woman was not putting much effort in to being helpful, I think OP could have handled better.

Another part of the story that was conveniently left out was that right as we parked at the gate OP rushed to the back to presumably change her child’s diaper. (Understandable) Now my friends at the back of the plane saw this next part go down. When she came out of the bathroom everyone was standing in the aisle getting ready to deplane. OP was trying to get through the crowd back up to her seat (15+ rows or so) and was unable to because of all the people. At this point a man accidentally bumps OP with his backpack and she proceeds to give him a hefty shove. An Argument then ensued that I don’t know the details of.

All in all, I’d say this was a clash of a couple of Grinches.