Coming to think of it for the first time, I think that Pammi made the right decision by not telling Kanya about the whole issue. Why? because her decision has sparked the current track! And I love the current track! If she told Kanya that Ranbir has refused to marry her right then and there, she would have most likely have not taken the irrational step. Because she went to see herself, why Ranbir was not talking to her in the right manner she made the irrational decision (why I am not sure myself if it is irrational or not), more of shock, and then taking a dramatic step.