So based on the current evidence and information it looks like the following:

Moved to E+ exit row and words were exchanged. According to her she moved back to original seat.
UA crew decided to remove her and she refused. Police called and she refused to leave. Was arrested after telling police "whatever you have to do".

Questions for others: Assuming she was flying out of NYC how would you route through SEA to get to Alaska (ANC?) on United? Seems interesting that she paid thousands of dollars for this fare that was possibly booked on multiple carriers to save money.

She was stubborn and was not listening to any commands. Even if she was in the right she lost that when she refused to deplane.