1878 - Allen was born in Cheltenham.
1898 - Attended and graduated at Princess Helena College.
1914 - Co-founded the Women's Police Volunteers and became its Sub-Commandant.
1922 - Trained women in Germany.
1925 - Wrote the book entitled The Pioneer Policewoman.
1934 - Wrote the book entitled Woman at the Crossroads.
1936 - Wrote the book entitled Lady in Blue.
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