Sounds very much like a tall tale to me. They use a similar response to determine constriction strength on live prey items, but I would be SHOCKED to hear it translate at all to their behavior around a human that they likely view as a predator-type.
It probably has more to do with comfort than anything else. In your hands, she's likely feeling more exposed and vulnerable. Your chest is likely a warmer, more stable surface that she is relaxing on.
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