I feel the only reason the CVs brought this Rani track was to give Shradha a way to prove herself to Sher after that whole "Virat affair" deal. Since Sher lost trust on Shradha and BD accused her of having Virat as a lover, Shradha can only prove her "love" by trusting Sher in the whole sexual assault case, according to CVs.
Otherwise this whole Rani track was unnecessary and not needed at this time. Shradha's character building could've been done using BD and Sher. I mean at the end of the day if Shradha wants to become stronger, she needs to be able to stand her ground in front of both BD and Sher, whether that's in terms of her duties in the house, her feelings towards Sher or her thoughts about their family business.
The Cvs don't need to bring more external characters and tracks for character development this early in the show. They already have enough characters and on-going tracks in the Singh house to keep the audience entertained for a while.
-Lost-