With those codes and that gas mileage, I'd start by checking out the CPI and nut kit. You can find info in these threads:
http://www.automotiveforums.com/vbul...d.php?t=462726
http://www.automotiveforums.com/vbul...d.php?t=473110
http://www.automotiveforums.com/vbul...d.php?t=503238
What kind of problems is she having? Hard starting... rough idle..... stalling...loss of power....gas smell?
When was the last time that a tuneup was done? Spark plugs, wires, cap, rotor, fuel filter, and air filter?