 Garrett also kept a diary, which was given to her by the philanthropist and longtime friend of the Garret family, George Peabody, the respectable founder of the Peabody Institute and George Peabody Library in Baltimore.After leaving school, Garrett continued to learn from her father about commerce and the operation of a railroad company, later serving as his secretary.Garrett and her friends, including M. Carey Thomas, Mamie Gwinn, Elizabeth "Bessie" King, and Julia Rogers, were known as the "Friday Evening" because of their bi-weekly meetings on Friday nights.