Potty training 4 yr toddler

Hi everyone. My daughter was refused potty till now she is turning 4 on july and now couple of weeks she is peeing in the potty she is asking to wear diaper if she wants to poo and diaper only at night. So once we r going outside i dont have choice i have to put diaper on her. Im scared that she will go back to diapers. What should i do outsidr? Help. She is not going to use adult potty