It was probably trashed before they drew on it, maybe a large stain that couldn't be removed. I just can see someone doing this otherwise.
Personalizing a bag by drawing on it, even though expensive, is all fine, but those are some hideous drawings. However, it does match the outfit she's wearing.
As a side note, I've seen Olsen's beat up B. Bag mentioned a few times on here. Does anyone have a pic of it?