That's not the part I don't get. I understand why she robbed the bank, but if she had time to escape - I mean literally knew she could just walk away at any time while her captors were "at work", that's the part I wonder about. Apparently, a lot of people don't wonder very much.
That is where the Stockholm Syndrome comes into play. None of us can understand it because we haven't lived it.
Not too long after she was found I was at a gathering where it was the item of discussion. Most people there were military. I'll never forget when one, who had been a POW, silenced us all by saying until we'd been held captive for awhile we hadn't a clue about what we'd feel or do. I shut up!