I wouldn't easily say Ana is right now better than Maja. Of course, Ana improved a lot compared to the last few years. She now plays a more consistent volleyball,and as Bartek said She is very brave and doesn't have nerves that much. These things can be a big strength for a setter. Well, Let's say Maja is already one of the best setters in Europe or Maybe in the world. She is very stable and knows where she has to pass the balls at right time. The point of my post is both of them are GREAT setters. It's kinda shameful that there's Maja in front of Ana in the NT. Ana obviously deserves to play as main setter too.
I don't think Maja will stay on NT much longer, actually. If Serbia qualifies for the Olympics, I expect her to retire from NT after that, or at least take a break.
While we're at it, although she hasn't said anything, I'm pretty sure that Nikolic will bid farewell to NT after London too.
Speaking of Antonijevic, Terzic appreciates her a lot, but it's just that Ognjenovic is his "pupil", he was basically her first pro coach and they have a special relationship.