Without seeing the animal and if you can honestly rule out worms that may have ingested pesticide (or are red worms) or feeding fish containing thiaminase - all I can do is recommend you take her to see a vet.
Snakes will often roll and thrash and hold their head in weird positions when they are sick. However that sickness can run the gamut from a viral infection, a bacterial infection, exposure to temperature extremes, etc.
ASSuming everything you tell me is correct and that you are certain about her diet and temps, there is nothing I can suggest other than a trip to your vet.
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