She wouldn't have fell in love with saras of she hadn't of spent time with him in helping expose kalika and in making plans to get pramad and kumud together.
she even said in one of the episodes that she fell in love with saras seeing his devotion and love for her sis kumud which is why she is obsessively in love with him.
i have hated kusum since she fell in love with saras, she is so mad about getting saras in her life but not once has she thought how hard it would be for her didi to go on in her life without saras . Kusum had fallen in love with saras since two months ago but kumud had gradually fell in love with him once getting to know him. Kusum has always been happy and supportive towards kumud and saras's love.
she said she didn't fall in love with him purposely then why is she adamant in having saras. I think she was shocked to know that she is falling for saras and at the same time guity as she was falling for her sisters love saras but now that woman is hell bent on getting her sis out of the way as she is jealous of saras and kumuds closeness.
sorry about the long comment, just felt like giving my opinion.