If we think that Kasturi is putting on an act of being a kid, then surely she must have realised the true colours of Massi by now.. She saw that Maasi and Raunak came together to meet her at the ashram and in spite of seeing her alive, they did not take her to either her parents or in-laws house.. And she had to get the police to drop her home!!
What d u think.. maybe this will also be ignored by the creatives and become another blooper which already has a long list!!
Now, if she really has lost her memory..then yes, maasi being negative will come as a shock to her later on when she faces the truth..