I obviously don't know why the Chinese would have done this, assuming she was a spy at all, but I have to assume it was more related to information and access rather than economic sabotage.

Compromising Jensen like this, again if she was a spy, would be extremely difficult to pull off. If I were the CCP, I'd much rather use that leverage and access to try to extract information and have a spy close to him to push Nvidia's future decisions, whether he knows he's being manipulated or not at that point would come down to whether they believed they had sufficient leverage to keep him compliant.