My common bn get that pattern from time to time -- like your last picture. I notice it if the lights have been off or when they are underneath a piece of wood.
That top picture looks unusual to me. She does look very stressed. Is she usually that white or more like the first day pic? Did she spawn recently? My male is rough on the females when he spawns and they will sometimes have small white wounds or torn fins after.
I hear names like piebald, calico, marbled, etc., but I don't know what the differences are between them.