It can often be a confusing thing for both students and parents to understand; when is a student considered to be "at school" for disciplinary purposes? A quick exploration of the California Education Code can lend some assistance in answering this question.
The situation seems hopeless. Your child was suspended for a violation of CA Education Code Section 48900, most likely for 5 days. To make matters worse, you were called into a meeting with the principal and other school personnel, and you were told that your child is being recommended for expulsion from the school district. You were given a date where an expulsion hearing would take place, and told you could have someone there to represent you and your child, but really what can anyone do?