I think the story has not ended for Sahiba and Daljeet. First, during Sahiba and Ranveer's first wedding when she went to the temple they showed Sahiba and Daljeet praying together. I think this was to represent that their destinies are tied together.
Second, while she is happy to be back with Ranveer I don't think she has gotten over seeing him with another girl early (this has created distrust in her for Ranveer). So, reservedness is not baseless as suggested. I think eventually she will find out about Jazz and this will be the end of Sahiba and Ranveer.
Lastly, is Ranveer's thirst for money which will lead him to marry Jazz.
Just my observations.