[Unduly personalized text deleted by Moderator per FT Rules.] She had the option of doing exactly what you seem to think she should have done: feed her baby in her assigned seat. She doesn't have the right to have other passengers forcibly rearranged in the cabin to her liking. She could have accepted the situation for what it was: everyone in the coach section of the airplane is in cramped quarters and must sit next to strangers for the duration of the flight.

What I'm suggesting is that if she could not or would not accept that situation, she had the option to go to the lav to take care of her business. Not because she had to or should have to, but because she chose to, if remaining in her assigned seat and doing it there made her uncomfortable. That would have been more reasonable than forcing others to be moved.