Hi Bruno,
It sounds like she wants to go down. 70's is too high for her to really go. It should be more like 45 to 50 to get her in full hibernation mode.
A refrigerator is an airtight container, so not recommended for hibernation. It would also be difficult to keep the sand humid as the refrigeration action naturally pulls moisture from the air.
A garage or shed could be good, if the temps won't drop below 40 or so. She should have a 20 gallon size tank with about 6 to 8 inches of sand for a good hibernation.
Moisten the lower couple of inches of sand, but leave the top dry, except maybe the corners, where you can add water maybe once a month or so until she wakes back up.
Put her in this kind of setup and give her 2 or 3 hours of heat per day, letting the temps drop down at night. She should dig in.
Sometimes they won't dig in though, and it is safe to let them remain on the surface, as long as there is no predator threat and you ensure the sand gets some moisture from time to time. You also should make sure she drinks well before you put her down for good.
I'm sure others here will have some things to add or some alternative methods.
Good luck!
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