Samarth, seeing your question I was thinking and almost feel like maybe CV's are maintaining Kusum's character for future. Kumari is still like a college girl who plays and teases around, but Kusum is almost shown to be in par with Kumud like in one of the dialogues she said "Are you trying to hide your emotions like me and Kumud does". So looks like SLB is keeping his backup showing her mature and understanding her sister's problems and helping her in her own way.