didn't want to hijack someone else's post, so here we go
https://twitter.com/sezmohammed/status/1252500993972948992 has excerpts from a book explaining this in detail
the tl;dr is that Stockholm syndrome was based around the woman trusting her hostage taker more than the police, as that police was a way bigger danger storming in with guns
and the ""diagnosis"" was made without even interviewing the woman in question, but just as a way to silence her, because obviously one should always side with the cops /s