Was the bloating sudden? Did she experience this at any other point since she started the challenge? How did her food for the last 2 days vary from her food since the start of the challenge?
When did the discomfort start in relation to her meals for the day?
I would suggest cutting out the biscotti and crackers, to start. If that's breakfast, she may want to sub it for some eggs or an omelette. If she's not hungry for breakfast, she need not eat at all.
It's difficult to troubleshoot without her being 100% compliant. It could still be the flour or something else in the soups.
What are her goals with the 21-day challenge? Any symptoms she's trying to alleviate? Just fat loss?