[Arneldo]

I dont think Nikki is that smart to be honest.
She could have been thinking about anything that put the smile across her face e.g Waking Richard to see if they wanna fail the task - Cause she did do that imieditly after leaving and she did find it amuseing - also She was looking over to the hitched with the corner of her eye so mybe Lea was smileing at her or something we didnt see.