Kuhu has come a long way, many might think that she is selfish, because she is not outright supporting Mishti, but this is Kuhu's characters has been made to not like Mishti and I don't think there has been a solid turning point for either of the sister to just start loving each other. Kuhu is growing and eventually MishKu will happen, but for now I am really liking how strong Kuhu has become.
Everyone thinks, she has gotten her fairytale and only she knows what a nightmare it has been for her. She hasn't made any situation be about her like she used to. She tried to protect Mishti from a loveless marriage, she has tried to protect her Nanchak, she tried to prevent Abir from knowing whose roka it is, she didn't yell or fight with Kunal regarding him spiking Nanchak's drink.
Everyone has started to pour their heart out to her, be it Mishti, Abir or Kunal. She is there for all.