So it explains why Shiv & Sachi are different

Being the son of chotima, the reason why Shiv is so good natured and kind in heart unlike Saanchi.

i feel Ira is not bad she is behaving purposely like this as she feel she is the reason for mother and child separation and wants Shiv to be with his mother Choti maa She might be feeling guilty that for 30yrs choti Maa had to suffer seeing her child calling Ira maa .

That's how it seems like. Sanchi is combination of selfish manipulators Alok and Ira.😆
Alok and Ira's so called goodness is conditional. Till the time it benefits their interests. Same with Sanchi who was all Shiv bhaiya Shiv bhaiya till the time he was wrapped around her little finger.

I doubt if Ira is behaving like this purposely, to prepare herself for rejection in case Shiv turns to Meenu. So far, nothing that she has done gives signals in that direction. It only seems her ego is hurt and she is angry at being a taker, being lied to and kept in dark by her husband for years.