CPU seems to bottleneck a little. 2GB of ram helps a lot in WoW. Make sure the Multisampling is set to 1x
That's a widescreen reso.

you need a dual core cpu and maybe 2gb ram on dual channel mode but if ur on stripped down XP without any background programs and not heavy usage of 3rd party addons, 1gb ram should be fine. also, your graphic card should be upgraded a wee bit.

bottom line? new computer time.

as for myself... /flex to:
ALL video options maxed out, 8x multisampling

130-150 FPS

best way to determine if she needs ram upgrades or not, is to check your task manager while running WoW.

on performance tab, over physical memory, is it very low? or still got a lot of rams left, and also check ur ram usage %, is it always under 80%?
and is the HDD having a lot of activity and game freezes time to time? does she lag during alt tabbing? (heavy HDD activity during alt tab)

if yes to more than one or all of the above, then yes you need ram upgrade)

another obvious cause is your processor/3D card as mentioned earlier.

bear in mind TBC have its graphic engine upgraded. so while you may not lag in molten core/BWL/AQ40 etc etc in the old days, chances are even with 25man raid (15 man less than 4), you'll lag a lot more than before (SSC/TK above)

Bro... 6fps for x1650? that is way way tooo low... i had a similar specs of ur com last time. i get around 30~40 fps.. very smooth gaming.. even when i go Pvping also no prob... above medium settings.

I have two friends still using 9600pro for the game... still running smooth.. stable at 20fps+ and again P4 2.4ghz only old skool machine..

Maybe your girlfriend did not update her driver, not using the correct driver or maybe she is not using any driver at all? hmm...

btw i run on 1680x1050 native resolution on my samsung 226bw