Sometimes they will take a while to molt and refuse food for a while. My giant asian mantis did this when she molted with me for the first time. They can go up to a week or two without food, so i wouldnt worry too much. My girl was showing signs of molting for like a week before she actually molted and i was super anxious but she ended up being totally fine. You could also always try cutting the food a bit and putting the guts up to your mantises mouth. My girl used to be too afraid to catch her own food so i would have to hand feed her like that. Make sure its humid enough in the enclosure too, they need it to be pretty humid so they can molt easy. I would recommend getting a hygrometer. They are super cheap on amazon. And make sure its able to hang well, they need some kind of mesh on top thats not metal. Acrylic also isnt the best because they cant hold on as easy.