Whilst Pageticker can't be used offline, parents and teachers can select an earlier date when adding a reading log, by clicking on the date. This will open a calendar, where they can select an earlier date. So any missing reading logs can be added retrospectively.
The same functionality is also available on the Teacher Dashboard when you go to log reading for a pupil.
Where this can be found on the parent app
What does this look like on the Teacher Dashboard?