She worked at the White House for the Trump administration, she testified that Mark Meadows told Trump to say something to the protestors to get them to stop the capitol attack & that some of them had weapons. Her testimony included the president's response including statements like "I don't fucking care if they have weapons" and "they're not hear to hurt me" as well as his demands to be taken to the scene of the crime - "I'm the fucking president, take me to the capitol now."
She also testified she overheard a conversation between Meadows and White House attorney Pat Cippilone: "You heard him [Trump], Pat. He thinks Mike deserves it. He doesn’t think they’re doing anything wrong." This was in response to chants of "hang Mike Pence."
I think it's pretty telling that there isn't anyone willing to come forward to testify under oath, putting them under penalty of perjury, to contradict those claims. And testimony from people like William Barr, who was firmly in Trump's inner circle, don't seem to indicate that she's not being forthright about the president's behavior.
Some of the more amusing parts of her testimony include William Barr telling Trump the election results were not a fraud and Trump threw his lunch that was covered in ketchup against the wall. She had to clean up the mess.