There's nothing wrong with buying her a used PS2; I would say that PS2s and used PS2 games are the best gaming value out there right now.
I couldn't believe how many used PS2 games under $5 I saw the last time I went into gamestop.
Besides - if she's into console gaming squinting in front of a PC might not do it for her.
Its not that she's all that into console gaming. We don't even have any consoles. She plays some games on PC like Call of Duty 4, Mirror's Edge, and some RTS's. She is just very picky about games and wants something that plays like Kingdom Hearts. I tried the PS2 emulator, but it obviously isn't quite ready for primetime...at least not with KH2.