It wasn't a big fight. Sid just pretty much told her that he knows that she is at fault and that Simar always gets her out of trouble and brought up the chulha incident.
Roli was pissed that Simar decided to tell Prem everything which resulted in Sid finding out.
Roli said that those matters were between sisters. She told her hence forth not to expect anything from her.
Roli got permission from Mataji to handle all the Saraswatiji pooja preparations on her own without Simar.
Simar got a laptop for Roli which she decides to gift to her on Basant Panchimi.
Roli was holding a murti and she slipped a bit but manged to stabilize herself and Simar came at the same time and tried to hold the murti.
Roli told her she doesn't need her help and to stay out of her way and that whether she prepared well or badly for the pooja is her sole responsibility and that she would take responsibility for her own actions.