Nidhi knows that she is the only support for Baba in his old age. He has already had a heart attack. She fears that this may happen again if she chooses to marry Ashu. Her fear is not basesless. She is confused to choose between love and family. Especially a family which looks up to her for support.
Inspite of this, Nidhi will try to reach Ashu, with support from Rohan & Anji. Rohan will persuade her to meet Ashu. She will go to meet him for the last time and explain that she cannot play with her Baba's life. Baba will follow her, hear this and contemplate for some time (maybe a week or month, depends on CVs). Nidhi will now get serious about her career & immerse herself into work. During this time there will be a fake announcement of Ashu Mallu marriage by Armu and(or) Rohan.
I'm sure Baba will realise his mistake & ask her to embrace her love. He will see that time has NOT been able to heal Nidhi's wounds.