Doug Phillips of Vision Forum has written several articles about Shelby's fight with the leiomyosarcoma cancer:

One of the blessings of the life of Christ is Christian community — that glorious network of friends and family in geographic and spiritual proximity whose relationship one with another is God’s appointed means for encouraging the saints, building covenant-keeping assemblies and households, and advancing the glorious mission of the Church. Within such communities, our merciful Lord sometimes raises up a few special individuals whose life of servanthood, principle, and love is of such a quality as to win them an unusual admiration and affection from the entire community.

In our portion of the San Antonio Christian community, that bright shining daughter of hope was Shelby Kennedy. Seventh of thirteen children to Ken and Deborah Kennedy, Shelby’s life was dedicated to her family’s missionary outreach called Only a Servant Ministries. Loved by thousands who knew her, Shelby will be remembered for her indefatigable optimism in the sovereignty of God, her radiant evangelistic spirit, her self-sacrificing servanthood, her effervescent spiritual joy, and her ferocious loyalty to her mother and father.

Shelby was transported into the bosom of her savior Jesus Christ on May 31, 2005, after a heart-wrenching, eight-month battle with a rare and unusually brutal from of cancer.

Shelby was known and loved by people in four nations. It was my great honor to serve as one of her church shepherds for a number of years, and to count her my friend. In the eight years that I have known Shelby, I never remember a time when she was not happy, radiant, grateful, and explicitly praising God. Many thousands of others would testify the same. This was a one-in-a-million Christian who had an unusual spiritual gift of faith.

She brought hope to thousands through her mission work with her family throughout the world in regions as diverse as Mexico and South Africa. But Shelby’s heart always pointed to Haiti where she worked alongside, and on behalf of, her mother and father by personally administering Christian schools, participating in discipleship evangelism, and managing significant food distribution efforts for the destitute and needy.

Shelby was a woman who passionately and desperately loved her two fathers. Her ferocious loyalty and honor to her earthly father was only exceeded by her absolute confidence, love, and devotion to her Heavenly Father. At a time when America’s Christian community is rife with self-serving sons, daughters, and men in the spirit of Adonijah, Shelby was known to all as an honoring daughter who modeled the Fifth Commandment. Her ferocious loyalty to her parents, to her convictions, and to her faith were among her defining character qualities. Shelby was one “daughter of Sarah” who would never exchange her rich spiritual inheritance for a mess of pottage. Because she honored her mother and father, because she remained loyal to her Heavenly Father — “it was well” with Shelby, even in the midst of great suffering.

Shelby’s one unfulfilled dream was to marry a godly man like her father. This was not God’s will for her. It was, however, God’s will to allow Shelby to accomplish more for the Kingdom of God in her twenty-three years than most men could hope to accomplish in two lifetimes. In fact, Shelby goes to be with the Lord with a unique testimony that is reserved for only the smallest handful of recorded Bible heroes and modern Christians — Shelby, a sinner saved by grace, lived a life without regret, and without known blemishes on her testimony. To put it another way, there are no “buts” after Shelby’s name. No one says, “Shelby was a Christian, but...”, or, “Shelby had a good witness, but...”, or, “It is just too bad that....:” Shelby Kennedy was the finest example of servanthood, faith, and devotion that most Christians will see in their lifetime.

Some might say: Phillips, this is just kind posthumous hyperbole. To that I respond: Speak to any in our community who knew this girl and discover that these sentiments are unanimously held by one and by all who knew her.

Shelby’s eight-month battle with cancer was unusually difficult. She was diagnosed with a very rare and unusual sarcoma about which little is known. Those around her described her suffering as simply excruciating. By the time of her death, much of her remaining 90 pounds was the weight of the tumors which relentlessly attacked her and had spread throughout her body. Despite this fact, Shelby remained hopeful, trusting in God and utterly without complaint until the moment of her homecoming to Glory.

Shelby’s passing into eternity will never be forgotten by those who stood beside her. During the final hour of her life, Shelby was at home surrounded by mother, father, brothers, and sisters. They sang hymns and praises, read Scriptures, and offered her words of comfort.

Her last spoken words were to her father: “I love you, Dad.”