"Bhaiyaa,u didnt do my PunarVivah I was also UR SISTER then how can I let ur son's Punarvivah happen."
So she is basically jealous that she didnt get a chance and now Yash has got a chance though she was also a part of their family!!!
So if PS has looked into her matter seriously,nothing sort of this cud have happened!
Now how can PS justify himself to Bua when his aim behind Yash remarriage was Vansh chalaana. Since Bua Ji was a female,he ignored it. It shows that this persons doesnt really care for his family members' happiness. Even in Yash case his motto was a son from Aarti!!!
Really PV depicts some serious issues. Why Bua was not given a chance to remarry is one among them.