If Baba is saying something to her or anyone else then attack him but attacking the character of a woman you doesn't even know is disgusting.
I always hate it when guys fight with other and call each other with abuses like BC and MC because the fight is between you two and has nothing to do with your mothers and sisters. But still guys do this as maybe they wanna hit the weak point of the opposite person and as izzat of mothers, sisters and other related women is a weakness for males so they do it intentionally, just as baba brought Piku's name while attacking Manu.
But I ddon't expect a woman attacking the character of a woman whom she deson't know at all. No matter what Baba is or what he do or say but maybe his mother was a very decent, noble and respectable woman so her character should never be attacked while fighting with him.
I see no difference between Baba and Lopa here. Other contestants say bad things about each other but these two are saying bad things about the family of one they fight with.