Hello, We are glad that your second grade class is interested in learning about other cultures. After an Amish person joins church and is baptized they are expected to follow the teachings of the church as expressed in the Ordnung. They do not join church until they are at least 18 years of age, and they make a conscious decision to follow the teachings of the Ordnung.
Some churches are more strict in enforcing the shunning than others.
If a person asks for forgiveness and is truly repentent, they can be taken back into the church. Shunning applies only to persons who are members of the Amish church and does not include anyone who is non-Amish. This book is available on this web site.