I was confused too, seems like a total 180 from where she was a few weeks ago. She only agreed to Ram's marriage to make Ram happy. So why is she happy the other brothers are getting married in the same kingdom that she thought was "low"? I wish they had instead showed some scenes in between where they explained that Keikeye had come to understand Mithila's greatness, or had received news of the other sisters and how nice they seemed, etc. Something to explain this reaction.
On a separate note, she seems totally positive as a character now. I wonder if the writers got complaints that they were showing Keikeye "incorrectly" according to the written Ramayanas? In the Ramayana, Keikeye only turns "evil" after the marriages, and only then when Manthara poisons her mind against Dashratha crowning Ram king.
BTW, while it struck me as odd, I also was happy she didn't do any drama. The less of her drama, the better. But I guess her brother will be arriving tomorrow to do the drama part!