The easy solution for this is to just have your wife log into the account (yours) to which the camera is registered. There’s no problem having two phones/tablets logged into the same account. In fact, you can both be viewing the camera at the same time (bandwidth permitting).
The ability to set permissions for shared cameras is coming at some point, but it’s not super high on the request list. I’ve added your vote for this to Wyze’s feature request tracker.