It's her choice.

"May I get up now, Sir?" she asks you.

"Yes...," you say simply and strongly, feeling thankful she appears careful not to approach your slightly-risen crotch when lifting herself back to her feet.

"...And no," you add once she has done so.

"Oh!" she adds, looking into your eyes. "Well, it's a bit late for that addition, Sir, since you can see I have already stood."

"I certainly see that," you tell her, "but we both know it would do nothing to improve your ability to keep this job if you stayed in that position and place for the remainder of the day. Much the same way you were immediately punished for your mistakes, I believe you should be immediately rewarded for things in your favor."

"What do you mean, Sir?... If I may ask," she inquires.

"I mean this is your choice," you explain. "You may walk out now, and continue working at your desk, or you may remain in my office and prove your ability to follow orders."