Freedom

she brings a red cup to her mouth patiently waiting for the coffee to meet her lips, only to find that there's no coffee in a cup.

The cup wasn't half empty, it was completely empty and nicely dried with a paper towel only 10 minutes prior.
She stares blankly into a cup and bursts out laughing.

Everyone turns and stares in amusement. It's a first time since she joined the team that they hear her laugh out loud for no apparent reason.

She laughs so hard the tears are bursting out of her eyes and she simply doesn't care. She's finally free to laugh it out. Let them guess what the reason is, they will never know.