Calm is easier said than done. The first thing to remember ball pythons first instinct is to ball up not to bite. Bites often are feeding errors accidental triggers of feeding response. Rat scent on a hand or something. Bites are not bad often nothing more than a scratch. The frightening part is speed past that it isn't a big deal.
Calm start slow there is no rush for you or her. Reptiles operate on a different pace than us mammals we need to adjust to them. Take your time just be slow and gentle touching at first.
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