When reptiles are kept at suboptimal temps below what they should be, their metabolism slows way down. It takes longer to digest food, longer to burn calories. One of the reasons it's so bad to let them get that cold, is having food in the digestive tract for a lot longer than it should be greatly increases risks of bacterial imbalances and regurgitation.
Get those temps fixed ASAP, and I would stop feeding all together until they are correct. If you are short on cash, you can pick up an inkbird thermostat for $20-30 and a reptile under tank heat mat should be even less than that.
When temps are correct, she should be able to resume eating normally in a couple weeks, but if she refuses, hold off trying again for another 2 weeks. She may have a lot of digestive issues going on from being too cold for a while that need to readjust. I would also bring her down to pups for the first couple meals she actually takes, to really give her digestive system some time to kick back into gear. I can't tell without seeing at list a pic of her, but 840g at 2 years old, she is unlikely to be anywhere close to emaciated and in desperate need of a meal.
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