Galloway and several others are weighing in now many people think she wasn't a spy in the traditional sense of a spy. They think she organized a way to smuggle high end Nvidia chips to China getting around US export laws and that was her angle. She was selling access to those chips to people in China not secrets. There's an interview where Trump starts talking about it and he's asked about China reverse engineering and he says Nvidias chips are so complex even China can't copy them, which implies someone at some point had explained to him that's what China does they get access to something and then take it apart and reverse engineer the tech.
So lots of speculation is the reason Trump took no action is he was personally benefitting financially from Nvidias stock, AND the US economy was being propped up by Ai and Nvidia is central to that. If he took any action to stop those chips being sold, it was going to impact Nvidias stock price and the US GDP. Nvidia was selling lots of chips to her company so it boosted their sales.
At a certain point US intelligence people just go so concerned about the potential disaster, that someone just decided to leak the news to the NY Times to make it impossible for Trump to keep such close ties to Jensen Huang. With another trip to China in the not so distant future they simply decided we can't let him bring Huang along again it's just too risky, he's not going to do it himself he has no interest in national security he's making too much money, so they leaked the story.
Going to make a great movie some day