Katvon, one of the feature of this, is the failure of Susie Green personally, to recognise / care about the sensitive nature of that information. And for non of the trustees to question what she was sharing with them.
Susie treated that information as her property and for her to freely use for her own purposes without consultation.
This suggests, in a way, how much she regards mermaids families as her personal fiefdom and property.
No one, not even the trustees, seems capable of questioning what she was doing.