Not taking up for this particular caseworker or anyone attached to this case. They screwed up and they screwed up big time.
But in fairness to the caseworkers, it is their fault but it also goes higher than that. They have too many cases usually. That is true. They don't have a lot of time to spend on their neediest clients. Because they have a heavy caseload and more coming in every day. When a DCF agency gets low on funds, a hiring freeze is instituted before anything else. If that doesn't help, then layoffs follow. Home care workers and other support personnel are also in short supply, for the same reason usually.
Another problem is burnout. They see the worst things out of life, abused injured abandoned kids. But many times when they make recommendations problems arise. Sometimes it is the kids themselves. Not wanting to leave the parents they know, they may deny problems. Or they may resist entering the system. Then there are supers who haven't seen the kids, but decides not to remove them. Or the attorneys decide there isn't enough evidence. Or the court rules against them despite lots of evidence (just like in this case.) Many times they feel helpless and useless. That can lead to the apathy.
If a police officer or fire fighter comes in contact with a traumatic event, often they are given counseling. Caseworkers don't usually have that. They deal with it the best they can.
After the Rila Wilson case, IIRC they did a major study of the CPS in Florida. High caseloads, low caseworkers and support personnel were factors noted. CPS promised to correct that. Poor supervision was also a factor. They promised to correct that. Failure to visit and failure to investigate complaints were also problems. They promised to review their procedures and do what was necessary to correct that. Looks like it is time to review the review and see what and how many of those corrections were actually done.
As far as their use of English, most caseworkers rush through the paperwork because they have to budget their time between writing the reports and visiting their caseload. While they are writing they are also answering phones, filing and all the many other duties that surrounds their duties. That affects their writing.