Though we like Mr Ali tearing SB's BS apart, remember he is also setting up FS to be a beaten, 'slow', victim of coercive control here too..... That may all be true but that is not a suitable defence for what she did to Star and worse, what she let SB do to star. FS had a lot of people around her, she could have asked for help.
I'm well aware of the impact of gaslighting and coercive control, but letting the perpetrator of that to take your baby to sleep for 2 days in a car covered with diesel, dog hair and apparently dog pee...
In some sense she is worse than SB. Star was HER child, SB had no emotional attachment to her victim.