Bloodlust. Maybe after the first murder she realized what she had done and was inescapably wraught with the situation and her coocoo breaker tripped ??
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With a declared IQ of 70 I think her likelihood of escape increases dramatically with every assessment some psychologist makes. When she makes her break she'll have a bunch of guys in black robes holding the doors open and carrying her bags. While she's waving goodbye, they'll apologize to her for the inconvenience.