Have you had a chance to observe her in class?
DS6 attends a Montessori school. It sounds like the age breakdowns are a little different but for your daughter's age the teachers at our school are not going to push academics at all. So if a student doesn't actually seek out reading/LA works on their own, the teachers are not going to try to get them to work on that material.
So at our school, 4 year olds have free choice. They can do any works they want. That means if they want to spend their time grinding coffee beans with a hand crank grinder, painting, stringing beads, and arranging flowers, the teachers are going to let them. The teachers will introduce the LA materials but for that age the kids can choose not to do them. So in theory they could have a four year old reading at a high school level who chooses to paint flowers all day and dig in the garden and since that kid isn't choosing the LA works, they would say he is not ready to work on the LA works.
Just wanted to share our experience.
