I would get a Bricasti M1 Dac which has volume control and remote volume control. Plug that into your Mac. Then I would get a Melco N1 and record your music on that. Then I would download Music Life remote app on your phone or IPad . that will show all the music you have. All your wife needs to do is turn on the Bricasti then the Melco and then the Mac. Open the app, chose an album and enjoy.
But hey what do I know.
But hey what do I know.