This wasn't doxing. It revealed her arrest details, but IRRC in New York City, is public information.
The act of sharing it and aggregating it is the issue. The information doesn't need to be private.
* They arrested a number of people exercising their constitutional right to protest. In this case police abuse.
* Stated they were going to war with the mayor - after all he's is not 100% in support of them having no consequences for their illegal actions.
* Then deliberately published as widely as possible the details of his daughter specifically
Given their ability to completely control every aspect of this, it's clearly intended to achieve the same result of doxxing: if you don't do what we say, we will deliberately put your family's life in potential danger.
NYPD union is a gang. Every officer who supports this action, or any of the brutality and constitutional abuses by the NYPD is complicit, and are criminals who should be in jail.
No, the only reason they published this is to intimidate the people who are elected and who are meant to keep them in check.