Given that the family would catch Prem and Rahi openly flirting on his engagement day, it appears that Prem will be held responsible for manipulating Mahi and Rahi's affections.
It looks that Mahi and rest of the family will see Rahi and Prem declaring their love and feel tricked. Mahi will be seen enraged as she will be seen losing her cool at Rahi. She will begin to abuse Rahi and make his life tough.
It looks that Mahi is finally being married to her Love but she is not aware of the truth that Prem loves Rahi and he is compelled to marry Mahi against his preferences as Raahi wants her sister to be happy.
Mahi seemed to be quite happy about marrying the love of her life. She tries to contact her mother, Kavya, because she will be perceived as extremely nervous.