She's probably fine. That weight loss over that period of fast wouldn't worry me at her current weight.
How often are you offering food?
When my female BP, Shayna, fasts (every winter like clockwork - 4-5 months on average), I only offer 1X a month until she starts eating again. I consider it a fast when she's skipped two meals in a row going into winter. I also look at the behavior. When Shayna fasts, she "brumates" as well. It's not hibernation, but snakes can do this hybrid thing too. She's very sedentary, not out looking for food, and only comes out to drink and use the bathroom (rarely).
When she's like this, I only handle to clean the cage if necessary, and check on her every few weeks to make sure she's okay. When they are like this, they slow their metabolisms down and are burning very few calories.
Remember, almost 90% of our/human calories are burned maintaining body heat. Snakes, being ectothermic, do not have to worry about that.
I would offer 1X a month until your snake eats again. Also, from a weight perspective, I wouldn't worry until she's well under 800G. Further, I wouldn't be weighing her more than 1X a month either. Let her be and she will eat when she is ready.
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