In January 2021, she returned to the hospital with severe headaches. She entrusted herself to Blessed Carlo Acutis and Venerable Montse Grases.
An operation was initially scheduled for January 11. However, it could not be performed due to complications, including hydrocephalus, or fluid buildup in the brain. Then Teresita and her mother both tested positive for coronavirus, so they had to be put in isolation.
The drain placed in Teresita’s head to remove the excess fluid got clogged and began to fail several times, causing her severe pain. Meanwhile, the tumor continued to grow without the possibility of surgery.
Her mother said the young girl’s string faith helped her through the situation. “As she had offered up her sufferings, the thought came to me that Jesus was making use of them to save more and more souls,” her mother said, recalling the young girl’s words: “I’m offering it up for the people; for instance, for someone who is ill, for the priests.”
During the last weeks of her life, Teresita reminded her mother of Christ on the cross, particularly when she could no longer drink water, and the nurses put gauze soaked in water in her mouth.
At 9 a.m. on March 7, Teresita died. She was buried the following day. Cardinal Carlos Osoro, archbishop of Madrid, traveled to her wake to support her family with his presence and to offer “some words full of hope that visibly consoled Teresita's parents, relatives and the girl’s young friends.”
Fr. Camino concluded his letter by asking people to “to pray for Teresita and, above all, to entrust yourself to her because I am convinced that she will protect in a special way the entire VIII Vicariate, in which she was constituted a missionary.”