As far as weight loss I have had 200 grams hatchlings losing 20 grams in one bowel movement, it's nothing for an animal your size.
Does it happen that a female that size goes of feed for that long or even longer? Yes I have even had females smaller than that going of feed for 6 months.
What can you do, double check your husbandry, downsize the enclosure size to the bare minimum, take the animal for a car ride (I am serious) and be PATIENT.
Changing prey type is never recommended unless you are willing to keep feeding the new prey type for a long time if they know how to eat a certain prey and were eating it previously they will again.
People always forget that those animals are VERY efficient and they are on their own schedule.