Sabino is a catch all term fro unexplained white patterns. Tovero is a catch all term for anything that is tobiano + an "overo" pattern of some sort. Overo is a catch all term for a few patterns as well.
I don't think I can register her now. Never have done it before, but her sire and dam's papers were lost in not one but two fires! Lucky huh! I lost the copies the gave me when I bought her, and they lost the originals when their house caught on fire. I lost mine when I left them at mt mom's and THAT house caught on fire.