Previously Potty Trained Dog Going in House

I would like ideas for re-potty training a 1 year old teacup Yorkie. My Yorkie is 1 1/2 years old. The potty training has recently become a nightmare. It was difficult to potty train her on pee pads, but eventually I thought we had made it! Then she started occasionally going on the floor. Then we worked on the potty training again and thought I had success. She would go for weeks without an accident and then suddenly she just goes wherever she feels like again for a few days. This used to happen fairly infrequently, but now she has an accident several times a week. She knows she shouldn't do it because as soon as you walk past her or even talk to her she immediately runs to the kennel. This is a signal that she left a mess somewhere. I then know I need to go find her accident spot. Please help! I am at wit's end.

By Lisa W