Talking to the child's school or teacher in Canada would also be a good idea -- in fact, it may even prevent the phone call to the department of education.
In terms of going to school locally in the U.S., contact your local school district for information about that. You can use SchoolFinder to research their contact information: http://www.education.com/schoolfinder/
If a short-term holiday, it may be that the child can simply make up the missed work and wouldn't need to attend school. But again, please contact officials within the Canadian education system for the most accurate answer to your question on that end.