What Shagun exactly Want????

She is supposed to take care of Ashok and her marriage plans where Suraj is creating hurdle however a sudden change occur Sanjna come and Shagun revealing her past romantic moments with Raman and trying her luck in creating problem between Ishita Raman. I can fully understand if Param do this nonsense as currently he main objective is to break Ishita Raman apart ... how this sanjana thing started ... if shagun had problem and she wanted to attend Mihir's wedding she could have do it otherwise why planting a fake sister and creating problems for raman not mihir instead of why not trying to secure her position for dream wedding ????????? everything is confusing