According to Find a Grave this is a memorial to Ida E. Barrett who died December 11, 1879 Age 22 years, 4 months, 22 days:

History of Putnam County NY Page 478

Isaac Barrett married Tamar, daughter of Abram Cronk, February 14th 1852. They were the parents of one daughter, who died December 11, 1879, at the early age of 22.

This young lady was a general favorite in the community, and a bright and shining ornament in the Baptist chruch of which she was a loved member. Her loss was deeply felt and greatly mourned. The following notice, which appeared in the papers, expressed the feeling of all who knew her: “Barett-At Mahopac Falls, N. Y., Dec. 11, 1879. Miss Ida E., only daughter of Deacon Isaac D. and Tamar A. Barrett, in her 23d year.

“Her life from childhood was devoted to Christ. She was baptized into the fellowship of the Mahopac Falls Baptist church in the 14th year of her age, and her spotless character and pleasant manner won the admiration and love of all. During her sickness of nearly five years her suffering was at times intense, and she had many fears that she would fail to gain heaven, but she never murmured. Her constant prayer was that Jesus might be with her, and Jesus indeed was. Her last days were passed in almost angelic serenity and she passed trustingly into promised rest.”

Taken with a Tamron AF Aspherical LD 28-200mm f3.8-5.6