Ironically, I always wondered if the real reason for her deadly hatred towards Mo was a very specific situation, and I still believe it is possible.
She gets pregnant from CS in September-October of 2021, because having moved into his house, she plans to move further into his life, but he says, no, I don't want to have a child with you. Later in Mexico she finds out that the reason for his "no" was newly developed interest in Mo.
This could well be, only, if i am right, it is not a mitigating factor, it was CS's decision, why blame on Mo?
(And it wouldn't fly in court, because afterwards, she chose to get back with CS.)
JMO - but this was the explanation I gave to myself when I first heard about their break.