All school philosophies have pros and cons, strengths and weaknesses, so the issue isn't whether or not Montessori is a good choice, but whether Montessori is a good fit for your daughter?
This depends on her personality. If she is natually inquisitive and curious, self-motivated and confident enough to choose her own activities and explore the many options around her, then Montessori might be a great fit for her. She may enjoy the freedom to choose her own activities, etc.
In my almost 20 years of teaching, and working with a wide variety of children with a wide margin of skills, personalities and natural abilities, I'd say that the MINORITY of children fall into this category. For the children who do, I am glad that Montessori schools and other options of this type exist.
Most children, however, gravitate toward things they know and already like, and won't choose to try new things. For example, if she already knows that she likes to play with dolls, she may spend her entire day playing with dolls and never explore the learning stations set up for science experiments or counting, for example. In my experience, sometimes you have to lead a child to try something, and sometimes they don't like it initially, but after some perseverence, decide it isn't so bad after all.
I can't count the number of times in my career that I have taught a class and the kids came to me initially and said something along the lines of, "I don't like science, or reading, or math (take your pick)" But by the middle to the end of the year have decided that they actually DO like that subject after all! It sometimes takes a little patience and tenacity and persistence to continue to pursue something difficult for us, and EVERYONE has something that is difficult for them to do. And most children I have known will not CHOOSE to persist in a difficult activity. If it is too hard, and they have the choice not to pursue it, they most likely won't.
So, I guess that is my main problem with schools that operate under the Montessori model. It is all fine and wonderful to assert that they give the children the choice to choose their activities, and that children are natural learners and that we can trust them to pursue their education at their own pace, and for SOME children, that is true. For MOST children, that is true only in the areas of their strengths or tendencies. To be truly educated, we also need to work in our areas of weakness and difficulty and to gain competence and confidence in those areas, too. And learning to overcome an obstacle is very valuable for our self-esteem and future success.
My conclusion is then to decide if your daughter would choose to explore all of the options around her, even the difficult or uninteresting (to her) ones, and pursue them with enough tenacity to gain some benefit from it. If so, then by all means, she is a great fit for the Montessori method. But if you know that she will find the few activities that she likes and is comfortable with, and will likely ignore the other options just because she can, then a more traditional model of schooling will be in her best interest. That way, she will be introduced to all kinds of things, even things she would not choose for herself, and may even find out that she likes or is good at something she didn't know about before.
That's my 2 cents,
If it is okay with you that your daughter