I agree with you Nice girl. The world may have called her anything but the fact that Ruhi and later Raman were there to take on the world for her, gave Ishitha a purpose to live. Even when she lost her baby the fact that her kids Ruhi and Adi were there gave her strength to mask her pain and move on with life. Whether it is Rohith or Shravu or Alia any of the kids in her life in danger makes her don the rescuer avatar. Remember in the swap episode right from the outset she was reluctant. Had just recovered from the bullet again Raman was overconfident of his plan. Yes Romi was careless but Raman was to be equally blamed.
Now resting the blame immediately on ACP and Ishitha was understandable. After 7 years if you still play the same tune, we are indeed expecting Ishitha to be the Martyr and we flog her for the same when she does.
Raman has had his family Adi and Pihu to love and redeem himself. What was Ishitha left with? She not only carried the guilt of Ruhi and bore the other labels Raman pinned on her like a gallantary award but is also guilt ridden that she is responsible for Mani's dependent state and loss in business. It is this guilt that prompts her to seek ways to make his business work.
As a last straw as a light at the end of the tunnel she is hoping for somebody to be totally happy she is back. Mihika and Bala walk away with Amma and Adi with Raman. So she still feels shunned scorned discarded.