She is tiny, but a tough little athlete, an ambitious one at that. She over-did it somewhere, landed wrong maybe. It doesn't look like a horrible problem yet, if it's just a sprain chicks have a lot of resilience in that department as long as she's eating, drinking and pooping. See how she is in the morning. The sling could be a good temporary remedy and relief for her if it doesn't improve or looks worse as you observe her through the day tomorrow. Hang in there!Thanks. I will switch out feed in the morning and add vitamins to the water.
I confess I get stressed because she is so tiny and delicate (though of course huge compared to even a few days ago!).