So sorry about your chick. Leg issues are certainly confusing in chickens. She could have had a riboflavin deficiency that caused her lameness, or perhaps Mareks disease, but she also could have a valgus-varus leg deformity which causes bowing and twisting of the legs. Here is a good link, and you will need to click on each page to look at the pictures: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1790586/