For any number of reasons, you might have troubled kids in a Montessori Classroom. Traditionally, this wouldn’t be a problem if you’re homeschooling, unless you take in foster children and have license from the state you’re living in to school your foster children in your home rather than the local public school, but if you’re teaching in a private school, or you have set up a private school in your home, the chances are that at least one of your students (out of your 30 kid classroom) will have emotional problems or be otherwise “troubled.”
One of the great things about the Montessori Method is that it was originally developed for the “unteachable” (read: the poor, mentally or physically challenged) so there are aspects of Montessori that can reach out to any child. The normalization period is going to be longer for a child who acts out or shuts down but it can happen, and if you are patient and tenacious, it will happen. There are some things you can do to minimize the lean times until the child has reached the same level as the rest of your class.
-Be sure you encourage appropriate behavior and provide reasonable consequences when the child acts out.
-Be patient and treat the child with the same expectations as the rest of the class.
I promise, it will be ok. Just give it time. He will normalize, just like the rest of the children in your class did.