> "Please come by my office in building D on the third floor and say hello."

I'd add another (possibly minor) item to your list, which is 'What actually happens if an employee goes to her office in building D on the third floor to say hello?'

Might sound trite but if someone makes this offer and those who take it up get rebuffed then I'd say it's not a good signal. Sure, she's crazy busy but she didn't have to make the offer and anyone who turns up obviously cares to some extent.