Probiotics are what help them break down there food in there stomach and intestines. Humans have them too.... the meds they give them for parasites tend to kill the probiotics in there stomachs... so you need to replenish that. Soy yogurt is the easiest way.
Some dragons just dont like it.... mine wouldnt eat outside her viv at all. I would suggest taking out a few things and feeding her in her viv. As long as you drop the crickets in one or two at a time... she should get them all.