The Collaborative International Dictionary of English v.0.48:

Herself \Her*self"\, pron.
   1. An emphasized form of the third person feminine pronoun;
      -- used as a subject with she; as, she herself will bear
      the blame; also used alone in the predicate, either in the
      nominative or objective case; as, it is herself; she
      blames herself.
      [1913 Webster]

   2. Her own proper, true, or real character; hence, her right,
      or sane, mind; as, the woman was deranged, but she is now
      herself again; she has come to herself.
      [1913 Webster]

   By herself, alone; apart; unaccompanied.
      [1913 Webster]