I agree Nidhi will leaveif she has any self respect.Ashu will play langdi taang with Mallu & realise his mistake that n'body is there to luk after him!!I conflict with all of you(sorry), I think nidhi will leave. If it was just dadibhua trying to convince her to leave it would be different and in that case she would ask DB to leave and she would stay.
But in this case ashu has disrespected DB, in the way he talked to her. That, I think nidhi will not tolerate. She stopped him in Kerala also and said "yeh jaise bhi hain Jo bhi hain mere baba hain, aur main inki marzi. Ke khilaf nahin jaaoongi. Aur aap inse aise nahin Bol sakte" . She will not tolerate any disrespect towards her elders.