Well, If she's not interested in excellent sound or 4.1 sound, just stereo, then the integrated chip will be a great solution for her. It does, however use a bit more processing power than a normal PCI soundcard, but not very much. But the sound cards r cheap anyway and even a dirt cheap SB 128 provide good sound for a 2.1 system. But she dont have to buy a sound card if she's not interested in excellent sound quality, and with 2 crappy speakers theres no need to buy a card.
U have two excellent options for a MB. The MSI K7TPro or the AOpen AK33. Both r non-overclocking boards. Both r excellent choices. They r one of the most stable socket A boards out there. The AOpen has a bit better performance, but the MSI has one more PCI slot (but the AOpen's 5 PCI slots should probably be plenty, though). I think they r about exactly the same price. Its your choice.