She could just be a little shy. Most of my snakes strike and coil their food within seconds. But I have one that takes at least 20-30 minutes to strike prey because they're really shy and need a few moments to become comfortable.
And ball pythons don't need sight. They can get prey blind and thrive fine. They use their heat pits and sense of smell to track prey. It could be that your food isn't hot enough either and she can't 'see' the feeders heat signature. Try hitting the head portion with a hair dryer before feeding.
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