Snakes can go months and months without eating.Remember that they can stop all together over winter.You should start to 'worry' when she starts losing condition, which shouldn't be for a while. Remember though, because you see her often, you mightn't notice a gradual decline in body mass until it has become dramatic. This is where weighing your animals comes in. 
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God is all-knowing and God is all-seeing, just who do you think you are to change his mind?
He already knows what you want and decided that you didn't need it.
So don't bother asking for cures or an answer, God is the one who gave you the cancer.
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