Apple's Airport Express will do this using iTunes and Airplay. It's easy to set up and use.
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I run an optical cable off the airport express into my DAC.I did the same thing, but I wanted to clarify that you don't need an external DAC to get sound from the Airport Express. It has an internal DAC. The audio port is dual purpose with 3.5-mm minijack for analog and optical digital. In your friend's case, you'll need a 3.5 mm minijack to RCA cable to connect it to her stereo. Something like this: 3.5mm Male To (2) RCA Stereo Audio Cable