I was offered (2014) a small jill albino ferret who was considered to need the attention of an experienced keeper. She was said she was wobbly on her rear legs and very tiny, it turned out she was, plus also being frightened and nippy. I suffered a few non aggressive though bites where blood flowed.
Within a short time she grown bigger and stronger. It took some months before she ceased nipping and became very tame and gentle..
She is kept alone, initially as she was nervous when introduced to the other ferrets, eventually placed in with Sandie and Milly soon after Daisy passed away. They subsequently became the best of friends, Jilly becoming the dominant ferret.