Another update: Poppy had an ultrasound November 8th, There was no mulch piece. I also talked to the vet about probiotics after the antibiotic treatment, He said it wasn't needed and her gut bacteria will return to normal when she has her next meal. He said this could've been caused by a tooth or nail of the F/T rodents? We don't know the cause for sure, So I'm not sure how to prevent this from happening again. I'm going to be feeding slightly smaller rodents and might cut their nails before feeding if recommended.