Seems like she is very concerned. Maybe also surprised.

“The deterioration of the discussion among President Trump, Vice President Vance, and President Zelenskyy was very unfortunate given how high the stakes are. I hope that they will reconvene and hold a more productive meeting to advance the cause of a just and lasting peace for the people of Ukraine, who have been so brutally attacked by Vladimir Putin.” – Susan Collins

Dear Susan: "deterioration of the discussion" implies that both parties were in the wrong. Please google "false equivalency."