herself vs themselves

herself

pron
  • The subject or non-reflexive object of a predicate; she (used of upper-class ladies, or sarcastically, of women who imagine themselves to be more important than others) 

  • Her; the female object of a verb or preposition that also appears as the subject. 

  • She; an intensive repetition of the female subject, often used to indicate the exclusiveness of that person as the only satisfier of the predicate. 

themselves

pron
  • The reflexive case of they, the third-person singular personal pronoun. The single person previously mentioned, as the object of a verb or following a preposition (also used for emphasis). 

  • The reflexive case of they, the third-person plural personal pronoun. The group of people, animals, or objects previously mentioned, as the object of a verb or following a preposition (also used for emphasis). 

How often have the words herself and themselves occurred in a corpus of books? (source: Google Ngram Viewer )