Uhm, after that "someone" joined a heist and took her hostage in order to steal money? That sounds like a problem, whether theory is shoddy science or not the thing seems real if even you, not victim, fall into that delusion.

People tend to be thankful to someone who makes things better even if that someone creates a horrible situation in the first place. It's a problem in politics especially, because it is more long term. Give people more comfortable life and they praise you even if your bad policies are the reason they famished previously.

If you justify her marrying the guy because he saved her from police, and you completely sideline that he needed to save her from police because he took her hostage during robbery and police came for that criminal, sorry that's just idiotic.

You can justify marrying the person who put you in direct danger of death for whatever irrational things like emotion, sexual attraction whatever, but you must acknowledge that it's highly illogical and quite worthy of a close look, if the original stockholm syndrome study is complete bullshit then someone else should do a better job at describing this bias.

Edit: thankfully, it turns out all that about marrying the hostage taker is false. (The logic in comment I replied to remains stupid though)