If you want a wireless DAC, the Audioengine D2 uses it's own wifi network ($600).
The SB Touch is very easy to setup and use, you could get one while they are still available. The software could be used with other hardware (ipeng app on idevice into digital dock) if the touch dies at some point.
Airport express is easy, but doesn't support hi-res.
If she already has an iphone, you could buy a Pure i20 dock and stream to it using logitech media server/ipeng.
The SB Touch is very easy to setup and use, you could get one while they are still available. The software could be used with other hardware (ipeng app on idevice into digital dock) if the touch dies at some point.
Airport express is easy, but doesn't support hi-res.
If she already has an iphone, you could buy a Pure i20 dock and stream to it using logitech media server/ipeng.