Your Taco Bell burritos may have lard as an ingredient.

You need more protein. If you can combine beans and rice in your burro, that is a complete protein. Building muscle helps lose weight because muscle needs calories to survive. I would suggest some weight training. Push ups (modified, on your knees) lunges (keep toes behind knees and concentrate on pushing off with your heel - activates the glutes), overhead press (light weighs or use some big cans to begin), etc. If you have a gym membership, that is even better.

You might add protein powder to your oatmeal and mix in a little soy milk.

Are you taking a multiple vitamin? Vegans often have problems getting enough calcium and B-12.