Re: Networking question
From Newegg or similar site, you can purchase 2.5" to 3.5" adapters for internal hard drives. I recommend you find the model of the hard drive (or at least the interface it uses), and find a converter online. They should run for $2-10, depending on type. With this, you can put it in your brother's desktop, set BIOS not too boot from it, and then you can simply access it from "My Computer", pull out all the songs and copy to another hard drive or on CD, then put the little drive back into her laptop.
Trust me, it is not as difficult as it sounds, its just a little delicate. Watch for static and try not to shake or hit it against anything if you perform this procedure. That's all I have, other than Chris's suggestion of getting a USB Network Card.
Either way, good luck, Hedoe!