It's been a long ten days for me
but here's my take on the revised script: first of all - a significant improvement!
Not trying to tell all the story (with all the flashbacks) helps focus attention on Rachel's tragic state (rather than how she got to that point).
As the others have said, it still feels "not quite right" but I disagree with them on the "why" and the "what to do about it". The thing that bothered me most on first reading this version is the double end: we see Rachel coming out of prison, in (presumably) a sort-of-OK-ish state of health; then we see her days/weeks/months/years later in a mess. That doesn't make sense from a story telling point of view: she's ended up in such a state when she should have been enjoying a "fresh start" - there's a whole story there and you've just skipped over it!
Now because you've filled us in on the background, we know that you want to tell the rest of the story, but someone watching without that knowledge would almost certainly think ... huh??? However, if this is intended to be a teaser to sell the full work to a producer, I would move that last scene to the start. So we see Rachel in a mess, then go back to the police interview, then back to "that night" (keeping the other clues), and finish with her coming out of prison. That gives us a partial explanation for her descent into misery, but leaves some of the story untold.
I would drop the scene with the child and the social worker, for two reasons:
(1) practical - it's hard enough to get releases for children when they have a good "positive" role; you're complicating things by needing a screaming, struggling child! Also, you've added another cast member who has to be dressed, not to mention three adults, two of whom need uniforms that require special permission to be used ... how big did you say your budget was?
(2) That's essentially an "action" scene, and you've already got a much more relevant action scene in the kitchen. Two in such a short piece is too much. It's understandable that, in the novel (and in real life) the taking of the child represents a key trauma in Rachel's life, but in
this story, it's of no real importance. In fact, if we
don't see the child at the beginning, and you keep the clues that there was a child involved at some point in Rachel's past (the ante-natal depression book, baby things in the room, etc) then we start wondering who she attacked - was it her husband or her child?
At this point, you're down to one lead and two supporting actors, two main locations (counting the three rooms in the house as one location; you could probably dress a garage up as a police interview room if you wanted to shoot everything at one site) and a couple of exterior scenes. That's well within scope of a small, local film-maker.