Thin ice at best. And if it was she should come out and say it or leak the minutes where that was established as the reason that Sam had to go, that the fall-out would be worth it and that Microsoft could be contained.
I think any action to immediately destroy OpenAI should have been preceded by being on-track to create AGI and strong indications that it was not going to benefit humanity, as the charter implies. Anything less and it's just a powerplay. But what is the point of having a nice fat red button if you never get to push it?