> And, from what I understand, that she wanted to discuss the issue in person when she returned from vacation (which she was on at the time.)

Then, she should have said that.

It would be ridiculous for Google to let her hang out at the company.

"Oh we cannot meet your meet ultimatum for sure. But please feel free to hang around and finish your vacation. We'll wait for you, a disgruntled employee, to choose when to leave."