That's awful.
Given the fuss that is made about data protection these days, you would think someone being in a safe house and their whereabouts being secret, would fall into sensitive personal data.
If I revealed far less damaging info, I'd be for it. If it's on computer her husband shouldn't have had any authority for information. It's private. You can't ring up a doctor and get info, even about your husband or an adult son.
I'm surprised the social worked wasn't punished severely if not sacked the first time, the second time she most certainly should have lost her job.