Actions speak louder than words. If she were truly sorry, she would’ve reverted the PR and have it go through the normal process. Instead she wrote a really long message about how the .NET Foundation owns your project.
It was (rightly) reverted almost immediately after it was first committed, a week ago. I wouldn't expect the author of this apology - posted today - to have instantaneously realized the error of their ways and ever had the chance to do the revert themselves, and I don't think that reflects on whether the apology is sincere or not.