* Childhood: She started writing poems and stories as a child, likely in her early teens.
* Early Adulthood: She continued writing throughout her 20s and 30s, but her work wasn't widely shared until after her death.
* Mature Works: The majority of her poems, considered her most significant work, were written between the ages of 30 and 40.
Therefore, there's no definitive answer to when she "started" writing poetry, as it was a lifelong pursuit. It's more accurate to say she began writing as a young girl and continued throughout her life, with her most influential work being produced during a specific period in her adulthood.