Last Friday, with three days on the job, my boss and I talked about the situation and how it was somewhat tenuous. She told me that she's selfish and hoped it wouldn't come through, mainly because all our client contacts wanted to have meetings on one of the days I would be out of the office. She's also rather snarky and funny, so when I shared the news that I wouldn't be going, and thus, would be there to have these meetings, she turned away, then turned back trying to hide the grin 'I'm so sorry you won't be going on your trip', failing miserably at a pout.
Informed her of plan B, she liked the alternative date I came up with to try again.
Haven't even been there a full week and she doesn't want me to leave? What a difference a new job makes!