Just a hunch, but

I'm guessing Miss Mochi harvested the sharpie from the pen cup on the desk. 

Crap. She's a monkey-dog. Everything not bolted down will need to be under lock and key. And she's nomnivorous-- she'll nom anything she can get her paws on. 

Sigh. 

Fortunately, she doesn't have thumbs (yet) and may never achieve her plan for world domination. Still, she'd be a wonderful little dictator. Come to that, I'd prefer her to other "leadership."  Next time, write in Mochi on the ballot. Chew-pens for every pot!