The key thing to remember is that it is Iras own home and she knows the lay of the land and the lay of the kitchen.
She has survived for 36 years on her own in this house before anandi came along as daughter in law, and can survive on her own even now. anandi acts as if ira is helpless or does not know what to do and tries to forcefeed ira.
In addition, I think ira is just using anandi to wash her hands off the medicine issue and anandi like a fool has fallen for it.
I mean, if medicine is to be administered secretly, obviously it is to be powdered and put in food or beverages. That is the only way. It cannot be administered to saanchi secretly by pushing it into her butt hole.
Yet Ira acted so helpless like "ab hum yeh dawa isse kaise denge?"
and anandi fell for it hook, line and sinker and said "ghabraiiye mat maa, mein use powder karke uske khaane mein doongi" ...
all of this was just an act on ira's part to make anandi the scapegoat if something went wrong, and anandi being anandi took it upon herself to feed her unnecessary notion of self-importance.
If anandi were a smart person she too would have sidestepped this and acted as dumb as ira.