I guess after ishita goes back to iyer house even trisha would be aware what happened to ishita so she should refuse to get engaged to mihir since mihir is extension of bhalla family that they treat dil like garbage
Ishita even when returns back to bhalla house should be cold and silent towards bhalla family and now unlike earlier it would be truly this marriage will be only for Ruhi ke liye and rest can go graze goats
Mihir should support ishita in outing pervert out and so good bond will be formed between mihir and his bhabhi and mihir tells her his truth and then ishita can appreciate and respect ishita more