Agreed that Minisha explains too much and over analyzes.
But in this case, Maybe in some corner of his heart sushant must have felt really bad when soni left, but I dont believe that sonali felt bad at all.
Sonali is just pretending to be sad when Soni left and is unnecessarily blaming minisha.
Sonali had the maximum arguments or dislike towards Soni. (examples hero villain task, foam , nominations)
PS: Actually Praneet and Minisha have quite a few interesting discussions over various science topics in livefeed. I am sure all that went over sonali's head. Sonali might NOT be able to comprehend that level of intelligent conversations.