I do not work for zoo creatures but, some snakes dont like to be handled, or take a long time to get used to it.
I dont own a snake, nor work there, but I have a friend who has owned and bred snakes for years. She said what Jaime said, as well as saying you need to socialize with it. Let it get used to you. If she still doesn't want to be held, don't push it.
It takes a long time for snakes to be friends with their owners, especially the big non-beginner snakes they sell. Next time start with a beginner level snake.
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