Shouldn't your emission warranty still be valid at 110k in california? If so bring it to the dealer to fix it, check your user manual to see how long is that warranty.
If it is short trip it is possible it went bad. Can you check if you hit something and dented it? There are universal CAL cat that you can hire a shop to weld on if it is pass warranty, they have the CARB number that would match the car, just not a bolt on so some welding is needed (i.e. $200), but it will be much cheaper than an OEM cat if bolt on aftermarket CAL CAT is not available.
If it is short trip it is possible it went bad. Can you check if you hit something and dented it? There are universal CAL cat that you can hire a shop to weld on if it is pass warranty, they have the CARB number that would match the car, just not a bolt on so some welding is needed (i.e. $200), but it will be much cheaper than an OEM cat if bolt on aftermarket CAL CAT is not available.