A.
I don't think the fact that she likes to keep clean hands means she has a sensory disorder. I know of a few kids with this, and they often have issues eating (preferring only certain textures, like baby foods instead of solids) and have problems concentrating. When a child has a sensory issue, everything is magnified. So, they hear every little noise. They often have problems with speech as well.
My daughter is a bit of a clean freak. She doesn't want to be dirty. But, that's just who she is. We just spent two weeks with my sister, who is a pediatric nurse and who also has a lot of background with special needs, and she never once mentioned a sensory issue. My daughter is just a bit of a princess!