Those are the same questions I have @gemme. I think a lawyer amongst us is best to answer.Two things from your article stood out to me that I can't make sense of. Jane Doe is the mother.
How would graphic images of the children's deceased bodies, or graphic details about their deaths, and LE's investigation, put the mother's life and physical safety in grave danger? Would it be that people would get angry at the details, and blame the mother for allowing him to take the children for a visit? Or could it be something else?
1) the records could contain sensitive personal information related to "Jane Doe," as well as "obscene or graphic images of the children's deceased bodies; obscene or graphic details and information about the children's deaths and/or cause(s) of death; and /or other information regarding law enforcement's active investigation."
2) "... Disclosure of these exempt public records would put Ms. Doe's life and physical safety in grave danger," the lawyers wrote.
The terms 'obscene' and 'grave' got my attention as I can't interpret their meanings in this context.
So I went to Merriam: OBSCENE, GRAVE
The best lay interpretation I come up with is the content related to the girls bodies and conditions when found is abhorrent.
And perhaps something in the material could give away WD's location(s) and she believes TD is still a mortal threat to her.
IMO.