@ Subha, during SSM track , Bhabho realise that she has no control on RP without suraj . If sandhya is not there , suraj will not be there. So she started to adjust with sandhya.
And the vachan she asked during theri return and also the eight vachan shows that she didn't trust her completely .I'm sure , Even now too if Sandhya did anything against family, she will return to her egoistic mode.