I'm having a major headache inducing issue with iCloud sync. My wife and I have shared calendars for a long time and it has helped us a great deal. The problem now is that my wife's iPhone has stopped syncing it's calendar with iCloud. If we log onto her account at iCloud.com and add somehting, it syncs to my iPhone as usual, but not to hers. If I add something to my calendar in my iPhone or iCloud.com, it does in fact sync to her iPhone with some lag. What seems to be cut off from iCloud is her own calendar. I have tried all possible settings with iCloud and calendar app etc, nothing works. And yes, I've tried turning it off and back on again. Did a soft reset, didn't help.
Please, any ideas as to what can be causing this?