Yes, Sanjana, you are right. There is a change in Amrit. She has become a very unpleasant person. But perhaps that is because her egoistic streak has become prominent.
Perhaps that was the ruthless side to her character that her mother always feared. Remember? Rani Rippan wanted Amrit to marry an honest commoner like Tej, rather than a corrupt royal like Adhiraj. Rippan wanted Amrit to leave the artificial atmosphere of the palace. The mother seemed to be afraid that Amrit could become amoral like Rajmata or succumb to false pride like Raja Sahib. Rani Sahiba did not have similar anxieties for her younger daughter who was humble and down-to-earth.
The tile "Amrit manthan"reminds us of the famous legend of the churning of the ocean. There, deadly poison had risen to the surface first. Only then did the nectar or 'amrit' (the source of immortality) emerge. In the same way, Princess Amrit's hidden negativity has emerged and overpowered her personality. It will take a long struggle before her better self-- a wiser, humbler, more humane self-- prevails.