Yea, if you have the money, MADCAP is right, except that your A/D converter is still going to be subpar. It will sample at 44.1 KHz, but that doesn't mean it will trace the wave at that point with the accuracy of a D/A converter in your home CD player. To do it his way requires a full pro audio setup with the computer acting as the HD recorder. If you don't have money to blow on equipment rentals, then the way I suggested should do it.
The mic could be a problem. I suggested modem mics because the one I have is quite good. But you'll have to test it before you do anything. Before she sound checks the mic, check the Line-In balance in a "silent" room. If it is louder the -60 to -50dBs (depending on your area, and whether or not the AC is on) then try a different mic. SoundForge will record in stereo, you just have to set the option. Protools is a professional grade program, and probably not worth the learning curve unless you plan on doing this more then once. IMHumbleO. Good luck again.