Original Commentary

It's amazing what Kimberly can do on short notice. I'm sure this isn't the first time she's done things like this, but it's the first time we've seen how she actually does it. As far as Brisbane knows, mind you, she's got the whole thing planned out - Terrence

Modern Commentary
Kimberly is being more than a little stubborn about this. We know that Brisbane wouldn't make fun of her for taking a job at the family business. He wouldn't imply that she got the job because she begged her mother for it - again.
It's not about reason. It was about pride. At first, at least. By now it's about justifying that she took this long to tell him. - Terrence