What does Ivy do in art class?

In art class one day, Ivy accidentally draws on Melinda’s shirt with marker.

Ivy is sitting at my art table with four uncapped colored markers sticking out of her bun. I stand up, she turns her head, and bingo—I've got a rainbow on my shirt. She apologizes a hundred million times. If it were anyone else, I would figure they did it on purpose. But Ivy and me have sort of been friendly the last few weeks. I don't think she was trying to be mean.