not sure what the deal is with the newer macs, but my old G4 (4 years old) does not have a stock audio inout of any kind. However, Im not sure exactly what she is trying to do, but most macs do have a built in microphone that often gets overlooked. If she is trying to record a hit record, probably not her best solution, but if she is using it for work,notetaking,etc...it could be an easy solution...