damsel vs girl friend

damsel

noun
  • A young woman who is not married. 

  • A girl; a maiden (without sexual experience). 

  • A young woman (of noble birth). 

  • A chattering damsel (component of a mill). 

  • An unmarried lady-in-waiting. 

girl friend

noun
  • A female friend, especially a woman's. 

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