1300 grams, I wouldn't worry too much. You are probably more worried about it than her. What size tub is she in, how many and what kind of hides? How often do you handle her? I wouldn't handle or bathe her before a feeding attempt. Also, how often are you offering food? Too frequently can stress her out too. I'd try cluttering up her tank with more hides or crumpled news paper, and just leave her alone for 2 weeks. Then try offering food. Personally I'd offer live. But I know that's not for everybody.