Why does she insist on being so cold?

[TurkeyPython]

Problem is 65 is too cold for them period. If she is willingly sitting on the spot that is 65F, there is something drastically wrong with your set up. Got any pics? Anything below 75F and you are risking an RI. Do you have a bright light on the hot side of the cage or something else that might be scaring her? I must have missed that you left it at 65-70 on the cool side. Raise the temps back to 78 on the cool side and 90 on the hot side. Maybe try and switch the hot side to the side she likes to sit on and see if she then moves to the new cool side. And also is this a glass tank? Do you have all 3 sides covered? Do you have the top covered? Like I said, a picture would help a lot more.

No bright light, it's set up exactly symmetrical from side to side, all hides are the same, there is wall on the back and hot sides, cold side is exposed. She does still moveto the cold side if they're switched. It has ZERO to do with security. The top is covered with insulated foam. I know what I'm doing. I've been keeping snakes for my entire life. Even before I was born my mother had snakes. Ball pythons and boas. All I want to know is why would she suddenly feel the need to be so cold. She is fine and healthy.