The Little Girl has returned to her mother. The system worked: she was removed from a potentially unsafe situation, placed in a loving home while things were being investigated, then returned post-haste.
We are sad that she's gone (sad for us) but happy (for her) as well.
I'm not sure that we will be short-term fostering again anytime soon, but I don't regret saying yes one little bit. I feel in my heart that the Lord is pleased with our willingness to be His hands.