Well said. I posted this on another post. So will copy paste.
Well the way I see it...she has played her cards perfectly A mastermind of a woman.
Sumer's motives for doing what he did makes more sense for everyone to believe he did what he did.
His anger towards Rudra was shown at the start. Plus his first crimes makes the other crimes believable as being planned and executed by him.
For Mohini to put it on her dimwit and gadhedo son made sense for if she goes in, an idiot like Sumer can't get back to Rudra & clan. So she is making sure she is safe.
The punishment she thinks would be less severe for Sumer (if she goes on to prove he is bawla and mentanlly unstable) considering he kidnapped Maithli instead of Paro and so she would somehow get him out. Also the number of years Sumer would be jailed.
If she accepts the blame as an elder she ends up being the mastermind. And the punishment would be more severe.
Some more on the same post that I added to comments -
If she has to hurt her son temporarily only to get back at her adversaries permanently, why not.
Sumer is her only escape at this point of time. When you are into such a dirty game, there will be some repercussions, which she thinks can be dumped on Sumer. Because she knows she is the smarter of the lot.
So its like son, I am doing this for your own good sake in the long run. For this haveli you would have to be behind bars for a while if it comes to that.
And another addition -
Oh people kill and murder for a lot less than a haveli that is as good as a palace.
Secondly she may have some past with Mala, like a troubled childhood over her looks or something...that has made her what she is...Evil to the core.