I don't think your granddaughter is being stubborn, she's just not ready yet. Even though she is able to tell you that she went, SHE has to be ready to sit on the potty and go, not you. Potty training is not really "training", its about the child being developmentally ready to accomplish that major milestone. You need to step back and give it a break. Ask her everyday, several times a day if she would like to sit on the potty. If she says yes, GREAT! If she says no, then OK, no big deal, no pressure. One day, she will just start doing it. My daughter would occasionally go on the potty during her 2nd year but didn't actually start going regularly until a week after her 3rd birthday. My son will be 2 on the 24th and he is no where near being ready to go on the potty even though he makes references to his wet diaper. 2 years old is a bit on the young side. Please don't pressure her, it will only backfire and give her anxiety.