Lindgren was the daughter of Samuel August Ericsson and Hanna Johnsson. She had two sisters. Her brother, Gunnar Ericsson, was a member of the Swedish parliament. She finished the school and took a job with the a local newspaper in Vimmerby. When she became pregnant with the chief editor's child in 1926, he proposed marriage. She did not accept, and moved to Stockholm, learning to become a typist and stenographer. There she gave birth to her son Lars in Copenhagen and left him with another family to care for him.