Double check the plugs - designed for 120K mile service life, but on some cars, they can wear out faster. Mine were worn around 95K miles, could have ecked out a couple thousand more miles, but the plug was starting to show excessive center electrode wear. Can't hurt to check the air filter and seal on the airbox, while you are checking the MAF sensor.
If you notice a strong rich exhaust smell toward the front of the car, or even a raw gasoline smell - I'd double check the injectors - see if they are leaking. Check for exhaust leaks - front pipe is well known to leak on both the 8th and 9th gen Corollas. If the rich exhaust smell is noticed well after the car has warmed up - possible that the O2 sensor is slowly dying or reading lazy. Mileage and age are about right for getting close to the max lifespan on this sensor. If you have access to a datalogger - might be worthwhile to see what the fuel trims look like (LTFT and STFT).
How often is the car getting driven - driving conditions? If the car sees a significantly lower amount of runtime/usage than before - sits for extended periods of time - could result in an overly rich run during idle until it gets to closed loop. Might just need an "Italian tune-up" - a good run on the highway to burn off deposits and get all the fluids up to temp.