I had a few dogs who have done that too. That just where they prefer to eat it, I guess. I know one of the dogs I have now, doesn't like the smell of the food in the dish .. so he'll take it out of his dish, and then eat it. I always thought it was because dog food has a very strong smell .. I know I don't care for it .. And knowing that dogs have such an acute sense of smell .. chances are, they find it a little overpowering sometimes.
Your dog brings her food into the living room because it is full or has been trained by somebody else to do that. Another reason could be that it feels lonely while eating the food alone. You need to re-train your dog on how and where to take its food to avoid it bringing the food to the living room.