They say that parents never favor one child over another but sometimes have to pay more attention to the child most in need. At this point it is ca, and will continue to be because she's so young.
Paakhi has been spoiled by Vanraj but when it's time to help her see the right path and grow into a mature, responsible adult, he's washed his hands off all his parental duties.
I don't think Anupama can really help or inspire her, because she herself isn't being a responsible person and is setting a bad example by neglecting her duties. Ironically, Kavya 2.0 is a much better influence.
As for CA, she's going to be hurting and feeling left out, neglected, etc. If this continues in her growing years, she's likely to start resenting her birth mother. Actually, I won't be surprised if the authorities refuse to let her be formally adopted later because her foster parents can't ensure that they can provide her a safe and healthy environment. If this happens, she will probably lose Anuj forever.