Do you really think this is about her refusal? She could have refused and he could have still raped her and she still should be beatified. If not, I question what the Church teaches here.
In comment 75, I shared what the Church said and I will also share here what St. Pope John Paul II said. If you question it and don’t understand it, then seek answers.
St. Pope John Paul II said
“She did not flee from the voice of the Holy Spirit, from the voice of her conscience. She rather chose death. Through the gift of fortitude the Holy Spirit helped her to 'judge”- and to choose with her young spirit. She chose death when there was no other way to defend her virginal purity. Maria Goretti’s blood, shed in a sacrifice of total fidelity to God, reminds us that we are also called to offer ourselves to the Father. We are called to fulfill the divine will in order to be found holy and pleasing in His sight. Our call to holiness, which is the vocation of every baptized person, is encouraged by the example of this young martyr.
Look at her especially, adolescents and young people. Like her, be capable of defending your purity of heart and body; be committed to the struggle against evil and sin, nourishing your communion with the Lord through prayer, the daily practice of mortification, and scrupulously observing the commandments. Do not be afraid to take a counter-cultural stance, to reject the world’s idols when it is a question of courageously witnessing by your lives that you belong to a chaste and poor Christ. Always esteem and love purity and virginity.
"In her silent heroism, Maria Goretti is a teacher of truth, consistency, and true love. She teaches us to rediscover in Christ the value of the truth which frees the human being from the slavery to material realities, to cultivate a taste for authentic beauty and the good which overcomes evil.
“Today, we thank the Blessed Trinity for this young life, and for the martyrdom which crowned it. Through her life and heroic death, the Son of man was glorified at the beginning of our century. ‘Blessed be God in His Saints’.” (L’Osservatore Romano- English ed., 10/7/91)