God, this movie was so good. I don't think anyone is still paying attention to these comments, but in case someone is, I just want to say that I don't think that the movie expresses any particular sentiment that the line staff are better equipped to diagnose stuff that's going on with the kids than therapists or counselors or the like. We do see Grace feeling that she knows better than those other folks on certain issues, but that's her perspective based on her limited context. It's a feeling I've certainly had at work in my job about things that aren't actually my purview, but I have to remind myself, as Grace's supervisor does her, that I do not have all the facts or training that those people do.
She is right about Jayden's situation, but I think the point there is not that she has special insight into things because she is working with Jayden as line staff, but because she identifies with Jayden, and has a significant amount of life experience in common with her, including, as we discover, similar issues with her dad. I think it's pretty explicit that Grace is seeing her own past trauma projected onto the signs that Jayden presents and making an accurate diagnosis on that basis. It also would appear that neither Mason nor Grace's supervisor are aware of that past trauma, or at least its details, and Grace isn't about to bring it up to lend credence to her argument. (I think that that second "whatever" is pretty significant also - Jayden's just begun to smile and be appreciative about Grace's gifts and then the subject of her father comes up and she just shuts down.) She may or may not be correct in her assessment of Sammy's readiness to lose the dolls, I don't think the movie gives us enough information to say. And certainly she doesn't have any special insight into what's going on with Marcus, or certain events there would probably not have happened.
Oh, and you would know Nate from The Master. Haven't seen it, but according to the Filmspotting review, which I listened to after this podcast, he was in that.