For some reason, Google Calendar on Mum's Nexus 7 has a long-standing bug where it spontaneously forgets how to sync her calendar data. Since I'm on the other side of the country, and I don't use Android at all these days, here are the notes on how to fix the issue.
- Open Settings
- Select Storage
- Select Apps Data and Media
- Sort Apps By Name (using the right-hand menu)
- Scroll down to Calendar
- Remove Data
- Scroll down to Calendar Storage (this should be the next one on from Calendar)
- Remove Data
Make sure you do both Calendar and Calendar Storage!
- Go back to top of Settings
- Under Accounts, go to Google Accounts
- Select Sync (using right-hand menu)
