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She certainly won’t have been chubby at her previous weight, that isn’t high for a hybrid, she does look fine in the photos, not thin or in poor condition so the weight loss is a bit strange, have you checked to make sure she is eating ok & not just hoarding most of her food?
I really have no ideas to suggest as to why it may be if she’s able to eat, teeth are ok etc but if she continues to lose weight I would consult a vet & see what they say.