Answer:
She enlisted some of Union supporters and made them her carriers of secret information to General Grant.
She used invisible ink to write her coded messages and hide in hollowed vegetables which were delivered to General Grant.
Explanation:
The stated incident appears in the short story titled "Spies in Petticoat" written by Lisa Torrey. The story is about the women who played a major role during the Civil War by serving as a spy and risking their lives.
One of them was named Elizabeth Van Lew. She lived in the South and was sternly against the slavery system that she even convinced her family to free the slaves. When offered to work as a spy by Union General Grant, she readily agreed to it.
The author has illustrated the creative and careful ways through which Elizabeth was able to transfer the secret information to General Grant.
The supporting details from the text are listed below: