The facts?
I don’t recall the report proving anything. I also don't recall the reporting of the complainants' backgrounds.
The care industry is very heavily monitored. Whether it's the Mental Health act, Safeguarding, human rights, immigration, health and safety, HMRC, DBS. There are forms to fill in and file with the relevant authotlrities for just about everything. Not to mention unannounced CQC visits.
The woman in the OP may well have come up against a bad employer but not to the extent she claims, unless her visa was acquired fraudulently. That then becomes another story.