She would have gone with the children to Alderaan, protected da Bail Organa, away from Vader. She would founded the Rebel Alliance, along with the other senators, like in UE, and Luke and Leia would grow together, fighting the Empire. Eventually, Vader would know she was alive, and he would stay emotionally shaken and would go back to the light side to be with his wife. He would have to face the Emperor to return to Padmé ... So, Padmé, dying o not, Anakin will fulfill the prophecy because of his Amore for his family.