I don't think there was any deception concerning Xivu Arath, she is thinking outside the box, and knows her enemy , conventional force just plays into Xivus hands, just like we played into Savathuns by killing Riven, and The Cabal tried to fight War with War and lost their homeworld Actually her initial Idea of not fighting was better, but Ana put her 2 cents in a situation she didn't understand, so Mara had to compromise I actually like Mara now more than I ever have, in D1 to D2 Season Of The Lost,I thought there was nothing more to her than her looks, and was a self absorbed narcissist , but thinking back on it, she has always been our ally, helping us when her brother counseled against it , and Oryx would have burned earth if she didn't stop him at Saturn, sacrificing the lives of her people for the last city , now she acts has our guide on things Zevala,Ikora or Eris can't There is no way of knowing how Bungies current narrative team will write a character, but I hope Mara never betrayes us