As to whether or not this is a "hunger strike", there's a first time for everything, and she's also about the right age to do it.
I wouldn't offer food weekly, I'd do not less than 2 weeks. Another thing, you're going by the temperature on the thermostat, right? Be sure you take the
actual-IN-cage temperature right over the UTH & under any substrate...just to make sure it's not too hot where she might be touching. That alone could
explain her desire for the cooler hide, IF the warm hide is too warm.
She looks fine to me in photos...a cutie! But you've only had her "a little more than a month" now, right? How many times has she fed for you? Any?
And are you sure she ate rats (not mice?) prior to coming home with you?