I of course agree that appearing in the show would make a character like Isabel more likely to be produced. I actually think there is some story potential based around her being an autocoach such as the other engines teasing Oliver about his coach driving him only to get into a situation because they didn't listen to their coaches or Annie an Clarabel being jealous because they can't control Thomas. Isabel actually would have worked perfectly to bounce dialogue off of in the beginning of Busy Going Backwards with Toad being jealous that Isabel can go forwards but not him. Though I don't see the TV producers adding her to the show at this point.