I found my runner duck injured yesterday, covered with flies. She has an injured thigh.chest, I think from a snapping turtle. I washed her off, gave her 1 shot of Penicillen, & covered areas with antibiotic oint. Well today she has millions of tiny squirmy crawly things looks like very tiny maggots. I gently hosed her down, poured hydrogen peroxide on them & nothing is killing them. Should I put her down or is there any hope? She has diarrhea, not eating, shivering. She did drink some water. Right now she's wrapped in a towel.