Looks to me like they refunded her the first class ticket for what it would cost to fly that last segment and let her fly for free in economy. It is probably a fair economic transaction, but not a very bright one by United.
They have her a voucher for future fight. No cost to them and she’s stuck on the airline that treated her like crap in the first place.
Just imagine if United had told Rep. Jackson Lee that she had to sit in the back of the plane. She would have compared herself to Rosa Parks on the floor of Congress.
She flew economy plus which meant she got free booze. Still a travesty of Untied Airlines.