My legbar showed signs of being lame saturday but by yesterday was struggling to get around and one foot completely curled under so she was walking on the top of it if she had to. Spending most time curled up. Today I've ground up B2 vitamin and put it in egg, food and water. She seems healthy enough apart from not being able to get around very well. She's eating and drinking. Foot and leg looks fine. I've put her in a small shelter we have which has a couple of wire sides so she's left alone and can just sit but see the others too. Does it sound like a vitamin deficiency?