Some stereos have aux inputs in the back of the unit, which you can buy some cables and/or converters and run a connection to the glove-box or center console.
Like this kit:
http://www.gtacarkits.com/honda_crv_...06_car_kit.php
Now, you'd have to do some research to be sure the unit she has can do this. If it can, you can probably get the parts cheap on ebay/amazon.