Let me guess, playing over wireless? Either use ethernet, or you have to dig into the registry, find the AudioSrv folder, edit the "dependencies" reg key and remove "MMCS" from the reg key, then disable the multimedia class scheduler service, and reboot.
Other than that, set the game to run as admin (if she has admin privileges) and in XP SP3 compatibility. Also make sure that multi-core rendering is turned on in the game settings. Also disable vsync for better mouse movement.
what about trying to run it as a Windows XP SP3? r
Worked so much better when playing in compatibility mode with XP SP2!! I get 57FPS on the Video Test.