I've already commented on a previous video:
Ketan's parents have said that they were reluctant to get their son married to Siya because of her young age, but were repeatedly asked and pressurized by Siya's parents for this alliance. It's clear her parents wanted access to Ketan's wealth through their daughter.
Ketan already had doubts about Siya and Chetan and has even expressed his doubts to his parents. He even took Chetan's name to his family with suspicion.
Some sources Siya even spoke to Ketan about this issue and he refused to stop the marriage. Doesn't mean he deserved to die. That was clearly wrong.
But, the real culprits are Siya's parents. They talk tall stuff on screen and behind everyone's back hire lawyers to defend their daughter. So Siya obviously won't reveal her parent's fault because she'll not have anyone to help her in this case.