Re: "Added wife to Apple family and need her to be able to share my iCloud backup
I made her a part of the family but she’s unable to backup to my cloud or share apps etc."
Wondering if you have turned on purchase sharing: Apple Support have article online (links bleow) that may help:
How to set up Family Sharing on your iPhone, iPad, or Mac - Apple Support
Eg: says:
"If purchase sharing is turned on for the organizer and other members, the family organizer pays for each member's purchases and must have a valid payment method on file." "(2: Accepted forms of payment vary by country or region.)"
You may want to browse through: What types of content can I share with my family? - Apple Support
(NB: Cloud+ is listed as a subscription you can share)
You can also: Learn how to add a family member to your shared subscriptions
and
See: How to share apps and purchases with Family Sharing - Apple Support
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For your wife: What to do: If you can't find your family's shared apps and content - Apple Support