Why did Emily Dickinson write the poem "Because I could not stop for death"? Did this happen in any part of her life?

One of the frequent charges made against Emily Dickinson
is that she was obsessed with death, mortality and dying. This poem is of course one of
her poems that fits into these categories, as it personifies Death as a gentleman
caller, who takes the speaker on a ride in his carriage. This is a highly imaginative
presentation of Death as a non-threatening individual - a proper gentleman caller, who,
of course, has a chaperone in the person of Immortality. the speaker in the poem
describes what she sees out of the window, and then describes how she begins to feel
cold. The house to which death brings her, like a bridegroom conducing his bride to a
new home, is a fresh grave. Here, however, they only pause; their ultimate destination
lies further on. Moving to the present tense the speaker then reflects back on the
moment she first realised she was moving toward
"Eternity".

Although such poems initially appear morbid to
the present day reader, we need to understand them within the context of the time. There
was the constant threat of tuberculosis; what we might consider common unimportant
illnesses today, such as pneumonia, then often led to death; even pregnancy and
childbirth were far more dangerous than they are now. For Dickinson, as for us all,
Death is the one completely unknowable experience, and thus she devoted much of her
poetry and time to imagining his many faces. Thus the key thing for you to think about
is how Death is presented in this poem and in others.