If Tina Parekh needed a break so badly, she would have taken a break off Kahaani as well - she is in there every day, her role staying constant and big....so how can we say that Tina needed time off? And if she wanted a break, Ekta could have sent Mukti and Prem on honeymoon or something, that would keep them away for a while AND keep the audience happy...
I completely agree with Vasu