My 13 Yr Old Daughter Has Been Having A Bad

My 13 yr old daughter has been having a bad time with digesting food and bowel movements. We have had blood tests for Chrones etc. During the last week we have followed a low fodmap diet. The last two days she has had a reddish colour (halo) around her stools. Looks like blood. Before I ring doctor in a panic, could it be from beetroot crisps?