Open up. Look for a free 5 1/2 drive.
Pop the drive in, and secure it with the screws, attach a free IDE cable, and you're set.
However, I am assuming that your daughter has 1 drive allready, and this is the second.
The primary drive, the one she allready has, is most likely set on master.
There are little jumpers in the back of the drive, that usually say MA, CS, and SL. Master, Cable Select, and Slave.
Cable select causes problems, so forget about it. When you get the new drive, check the old one to see what it is set on, and set the new drive accordingly, meaning, if the old is master, the new is slave.
Connect, insert a power cable, and, presto. You're done.
Windows will auto detect. Install CD burner software, and put some pressure on that baby.