Why are only one of my 2 Gmail account syncing?

[Caroline Fraser]

Have 2 gmail accounts and suddenly 1 won't sync

I have my daughter's gmail account and my gmail account among my other email accounts in my "Linked Inbox" on my WP Lumia Icon (running Black). On Sunday my phone started saying it wasn't able to sync w/my gmail account (but my daughter's is still syncing no problem).

I tried uninstalling and reinstalling the account, I tried a soft reboot. Any other suggestions? Help me please ;-)