After today's episode even dadi will think that she misjudged roshni
So after LCR when roshni will be on deathbed that time tabeezi will clear all the doubts Khans hv regarding Roshni (as she knows roshni though she is unaware abt her being ayaana ).
khans r such they won't believe Roshni even if she dies for them. So that time tabeezi will clear the doubts i feel. N may be it is the reason y makers hv not revealed abt Roshni n ayaana being the same person to tabeezi