The fact that you are still eating portions that small after a year is pretty amazing. When was the last time you met with a dietician and your doctor? I would talk with a dietician and doctor if you haven't already and make sure you aren't eating too little. I understand that seems counterintuitive for weight loss, but your body also needs the energy to stoke your metabolism. Even with the surgery, if you are eating too few calories, at some point your brain is going to think it's starving and put the brakes on your metabolism and really slow things down to conserve fat.
You have to balance maintaining a calorie deficit with getting enough food to keep that metabolism humming along, and the further away you get from the surgery, the more important that becomes. Some exercise and activity is always a bonus, and that can certainly help, but a proper food balance is the most important.
Generally speaking, if you continue the calorie deficit, the fat will come off eventually, but if you aren't eating enough your brain can really turn on the brakes and also make you hungrier and more likely to eat unhealthy foods in an attempt to make up for it. That doesn't mean you'll eat anything you probably shouldn't, but its a possibility because your brain starts to get desperate.
So, all that to say, I would definitely talk with a dietician about how much and what you are currently eating to make sure you have the fuel to drive your body to start being willing to burn fat again.
Good luck! I hope you get through your stall soon.