Why won't mine and my wife s iphone calendars merge/ sync?

Our calendars used to sync.whenever she added something to her calendar on her phone it would go to mine and vice-versa. It no longer does this. I can't figure out why. We text each other with appointments and things and each of us manually adds the others things. Please Help. Thanks in advance. We both have CALENDAR ON under iCloud. But it still won't do it.

She's having an affair and is encrypting her calendar.

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