But yesterday's epi made me think..
When she heard Radhika came her immediate expression was happiness. It was only the idea that Rads will meet Dev and her lies might come out.. that changed her expression of happiness. When Mrinu revealed about her hotel incidence to Brij Mohan her expression was guilty and then when she saw her father folding his hands in front of Dev and asking forgiveness on her part.. her expression was pained at the humiliation her father was entitled to because of her.. then at the end when Brij Mohan mentions Devki's illness she was concerned.
you can take her concern for her parents as genuine because they are her parents no matter how selfish she is she must love them right. BUT... why the happiness to see Radhika unless that she really does care even a little bit for her. There was a glimpse of that when Vishakha has thought that her father was fixing Radhika's marriage and she had teased her about it.. In Vishakha's mind Rads is really her sister..
Its another thing that she is selfish enough to blame her mistakes on her sister... but at least she doesn't treat Radhika like Amma does. She may be manipulative and puts herself before eveyone else.. but i think after her problems are solved she might actually care about Radhika.