Yes, she’ll need “Can Manage” access to be able to clone an item from a collection.
When changing the item ownership (as described in the comment I linked previously), the only options are going to be the organization and “My Vault”. If you do the cloning while logged in to your own account, “My Vault” will be your own vault, not your wife’s vault. So the cloning must be done while logged into your wife’s account.
I worded my instructions as I did because Bitwarden’s Terms of Service state that each Bitwarden account may be used only by one person. I highly doubt that you will get in any trouble for temporarily accessing your wife’s account to assist with configuration issues, but to comply with the letter of the EULA terms, technically, you should not be logging in to your wife’s account.