The Weirdness of it All

This story is about a girl who meets all of her favorite book characters at a top secret meeting, there are three other people there from Earth, and she knows all of them. Then she discovers that the people from the books come from different versions of Earth called dimensions. She then discovers why the government has pulled her all the way to a top secret facility in the middle of Idaho. There are 6 different dimensions and soon she figures out that there is a series of 6 books strewn across the 6 dimensions, there about her and the 3 other kids. They have to find them before The Villains do, otherwise there whole lives will be rewritten, but they are forbid to read them, it is too dangerous.