personally I think that she won't because EK regards marriage as holy, and the scene after Mayal marriage where Koyal says that she will die but never betray Maddy...this makes me think that maybe she wont betray Maddy even if he tries to sacrifice his love inorder to get raj and Koyal back.
I also believe that by the time Koyal needs to make the choice she might have fallen in love with Maddy.