I went to market with my wife to buy things for our new born baby, after my wife selected baby things that Worth thousands and I paid with my btc,the transaction was very easy and faster. When we returned home ,she asked if you die can I achieved your btc or continued with your account? Because it's very easy and faster in trading and transaction.
You could share the private key of your address with your wife and both of you could have the same address on different wallets. Or if you have an app or online wallet you could give her access to it.
The problem is the security, if both of you have the private keys and the wallet gets hacked, will be hard to know who was the target.
if you trust yourself enough, it is easy to say that the wife is the one being targeted. In order to be safe, you can use hardware wallet giving us fulll control with high level of security