ratchet gags and ring gags

My wife really struggles with ball gags, she has a really small mouth and ends up with a really painful jaw even with small ball gags. Would we be better off with a Jennings or Whitehead gag - anyone tried these, and are they very adjustable? Also I've seen pictures of what look like quite small o ring gags, but no idea where to get them (Love Honey don't appear to do) - likewise anyone know if this is a good idea for us?

A final thought, my wife said she'd be better off with a ball that was really soft - anyone any idea if such a thing exists?