Kara, although the above suggestions are all good, the first thing your daughter should do (if she's using a PC)is open the volume control program on her computer (Start/Programs/Acessories/Entertainment/Volume Control on my Windows XP system). When the program is showing on the screen, she should click on the "Advanced" button on the Microphone volume and make sure +20dB Boost is checked in the box that comes up. This can be one reason for very low recording levels on the computer.

That said, I've found that sending my sound through something that acts as a pre-amp is far better than expecting the sound card to provide the necessary sound levels. I once used one mic pointed at my chest to record both guitar and voice, but I've found separate mics or a guitar pickup and a mic to work far better.

FWIW, my "preamp" is the main speaker (control) from a set of Yamaha aplified computer speakers. It has two input jacks and one output, so I plug my guitar and voice mics into the inputs and the output is then sent to the input jack of my sound card. I think these were 5 or 10 watt speakers at the most, but the amplification it provides is more than enough.