it is more likely that she could be having a infectious or inflammatory disorder affecting the central nervous system (brain and spinal cord) resulting in neuropathy like symptoms. it would be best that she consult with a neurologist who can examine her and provide a proper opinion about further management.
i have a 2year old daughter who all of a sudden had problems with walking but before she was walking properly without any problems. suddenly she is a little bit shaky and struggles to walk and she is just cheerful she does not have fever but every-time she tries to walk she falls what could be the cause.