P.G.
My son has been in a Montessori program (Maitland Montessori) since he was 3 and it has been wonderful. He's now entering the 4th grade and has excelled in every academic area--testing in the 80th percentile or above in all academic subjects. All of his friends are Montessori kids and they are the nicest, most polite, and engaged children. There is no bullying or teasing at his school and the children possess an innocence that I don't see in many kids today.
I love Montessori. The child is given freedom in the classroom within a structural framework that is designed to help them learn at their own pace. The classroom uses mostly tactile and other sensorial techniques for the younger kids. The child is actively engaged with the materials in the classroom rather than completing worksheets. Also, there is a real focus on resolving conflict peacefully and cooperatively. All of my son's teachers have been gentle and kind. In the preschool the child can nap when he's tired and snack when he's hungry. They have ample play time, even in the older grades.
What I love most about Montessori is that the children are taught how to think rather than what to think. They are taught the concepts before they learn the applications of the concepts. For example, before learning the times tables they have to grasp the concept of multiplication. Before learning how to read they have to grasp the concept of symbols and sounds going together. Basically they go from the concrete to the abstract (which is how their minds develop). I also love that there is absolutely no pressure on the child to learn within a certain timetable. Each child in the classroom is learning at his or her own pace.
The co-founders fo Google credit their early Montessori education for their success. There is a lot of information on the internet about Montessori.
Good luck on finding the right school for your daughter.