Then she hasn't connected her phone correctly.
When you plug into the USB you should get a menu up that asks you what connection you want. You need to choose "Disk Drive", then it will appear as a new drive on the PC. Just like if you had plugged in a USB stick.
If the menu doesn't pop up when you plug it in, pull down the status bar and there will be an option which says "Select to change USB connection type", then choose "Disk Drive"
Then when it appears as a new drive, this is the drive letter that you choose to sync to.