Priyal defined Mona is what everyone have accepted till now.I guess it is hard/impossible for Sara Khan to become Priyal but practical for her to act like Mona.
The fact is she can never look or be like Priyal Gor as she is a different person altogether!
Sara has her own style of saying "By GOD", "Hai Rabba" and it is natural .
Mona is supposed to be 19 yr old and Sara suits her role well as she is around the same age and can act well .She has done a good job filling in the role till now, but I believe that she can/will even get better.
My suggestion for Sara is to be Mona in her own way, not to try to worry about filling in Mona's role as played by Priyal.
What is yours?
Please note:This is post for constructive criticism only... you are not allowed to bash here.