If your child misses a lesson it is vital that you encourage them to take the time to catch up. All lessons are available here in this site, the students LAL site and thier google classroom. Missing lessons can be unavoidable but that does not mean you have to miss important information.
Make sure they get the new google classroom code as soon as possible. Emailing the new teacher ahead of thier first lesson should help them be prepared. They may need to attach thier current digital workbook to an assignment in your new google classroom.
You will need to find out who your childs teacher is. They should be expecting you. Make sure you email the new teacher to get the google classroom code as soon as possible. You can find the lessons that have missed on this site.
You cannot loose all your work without emptying the bin in the google drive. You can go to the bin and retrieve the digital workbook. Ask digital services or the class teacher for help.
If in the unfortunate case that they loose all work then speak to your teacher immediately. They may need to re-do and need extra time to do so.