i think shes wrong to feel that... ashok abandoned both her and her mother long before he met meeta. its easy to blame the stranger but the fact is that ashok has never been a good husband nor good father. lets not forget he left for london months after marrying and didnt insist babita go with him, nor thought to return or force her to move when mini was born. babitas suffering started the moment he left her and from there only got worse.
Right now both mother and daughter are overwhelmed by anger, insecurity, and general frustration with things. On top of that they can't completely cut themselves off from the Khuranas so the wounds don't get a chance to heal. If they had moved to another city far from these people, it would have been easier but every other day something happens with the Khurana's and mother-daughter somehow get dragged into it eventually.
Minnie is starting to realized that her papaji is a jerk to everyone. Like her mother, she too must have wondered what attracted Ashok to Meeta, but after what she saw Ashok do to her she now feels he doesn't love his second wife either. So what was all that disruption and grief in their life for? To see her father humiliate yet another woman the same way? She's now conflicted by her sympathy for Meeta as a woman, versus her hatred for her as the other woman. She's feeling guilty for caring for Meeta on some level, because it makes her feel as if she is betraying her Babes.
The other woman doesn't have to be evil, and that is what the CVs are trying to show us. I agree with Beeji that Meeta needs to give Minnie some space. I think now that she is pregnant, her maternal feelings are coming to the fore, so she is being extra attentive towards Minnie, which has backfired, of course.
We would prefer Babes and Minnie to behave in certain ways but the beauty of this show is that the characters are flawed and don't behave in idealistic ways. Rather, they are realistic and act based on their emotions, rather than pure logic. I love how the writers show conflict at various levels in people's lives and all these complex emotions that kids of divorced parents go through. Things are not always black and white in real life, and we are now starting to see other shades of gray.