One psychiatrist involved in the investigation has stated that the guy was on a power trip and needed somebody he could completely control. It was suggested that she may have become more rebellious or opinionated as she grew older and that this may have diminished his interest in the girl and lessened his concern about a possible escape.
They seem to be trying to reconcile her escape (and her claim that she was sexually abused) with her attitude towards the kidnapper (i.e., "Stockholm Syndrome").
Her understandably odd behavior and unique emotional state has probably given them a reason to verify her claim by other means.
She's 5 feet 3 yet hunched over from living in a room this size?
Wouldn't malnutrition be a more likely culprit?