I completely agree with you Tina...
Awesome post... There has not been any clear indication yet. I mean a proper one...
Moreover, her missing from the show omg.. I was thinking the same I mean if they had to give her break why did they enter her in the show.?
Pressurization... Jeezzz if that was the case they could have asked.. Riya aka Sana to come back and work at the Desk doing R & D instead of completely wiping her out.. Moreover, if they had shown her present as R & D specialist in the office there wouldnt have been much harm and they could have entered another female character later down the track as Arjun's love interest...
Opps! I think I went a little too much off the topic?
P.S I agree with u and also the above is only opinion everyones could vary!