Honestly, Prerna needs to give it back to Nivi at least once. She needs to ask her how is this any different from the way Anurag treated me when he married Komolika and publically humiliated me? She at least has not insulted anyone. Back then Nivi completely supported Anurag in his move. In fact, she was happy Anurag had married Komolika even though she could clearly tell he had a feeling for Prerna. Where was her concern then? Can you imagine your siblings yelling at your ex for you? Anurag is not a baby. This is between two adults Prerna and Anurag. Not Prerna and the entire Basu kandaan.
Once again she is too focused on her brother's life. I can see her hating and venting out frustration for Prerna in private but going all the way to Switzerland and yelling at her is so over the top. Mishka also dumped Anurag for someone else. She did not even have a valid reason other than she was confused about her feelings. Did Nivi once yell at her? In fact, she was happy she stepped back into Anu's life. Nivi's character, for the most part, is inconsistent. Her only consistency is trying to butt into her brother's life because she doesn't have her own.