Total $500USD is it not? And that is just the BASE of the computer. We need a case, power supply, keyboard and mouse, cdrom drive, floppy drive, sound card, network card, monitor!, etc..
Oh, heh, sorry man but you did say she had a computer so I was thinking you would be canabilizing that box for parts. Anyway, to keep costs down I would get your OS, Monitor (local only), case, CD-ROM, CDRW'S and HDD's off Ebay. You can save a crap load of money that way (no offense to Newegg). Don't buy the HDD's used though...go for new only. I paid about $90 each for two 30GB 7200 Maxtors off Ebay about 8 months ago...this was when they were selling for $150 USD.