I need help! POTTY TRAINING ISNT WORKING

OK, SO HERE IS THE ISSUE. MY DAUGHTER IS 2 AND A HALF. I ALMOST HAD HER POTTY TRAINED BEFORE 2 BUT THEN USED PULL UPS AND SHE WANTED DIAPERS BACK. I HAVE TRIED WHAT I FEEL IS EVERYTHING TO GET HER TO USE THE POTTY AND NOTHING HAS WORKED. I NEED SOME SUGGESTIONS. DONT TELL ME TO OFFER HER DONUTS WHICH SHE LOVES IT DIDNT WORK EITHER. LOL HELP ME PLEASE!!!!!!