There are various ways of doing it Nigel. If the main unit is changer ready the one will be available from Ford. You should check to see if the car is pre-wired for a changer and also be prepared for a highwayman's price.
There are interfaces available to connect aftermarket changers to factory units which work with varying degrees of success and finally, an FM modulator kit in which the changer output is replayed via a dedicated radio station.
Personally, I'd whip out the Ford unit and fit a good aftermarket CD/MP3 player and your daughter can have as much music as she likes on three or four discs.