Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner, but can you tell me:
Has Blackberry had any known slips, falls, injuries, or jumps off a perch?
Is she dragging or favoring one leg?
Any swellings, sores, tender regions, boney crunching or instability when you feel the leg?
Any pain or stiffness when you flex/extend her joints?
Can she grip your finger with her toes? Any changes to the bottom of her feet?
Any belly distension or straining?