Sinita is a friend Minerva makes when she first arrives at school. Sinita and Minerva first make a connection when Minerva makes a gesture of friendship, giving Sinita a "friendship" button she had found.
When Sor (Sister) Milagros explained that the girls might soon become women, when their "complications" begin, Sinita has no clue what she is talking about. Minerva tells her what she knows about periods and pregnancy, and Sinita, while shocked, is indebted to Minerva and promises then to tell her about the "Trujillo secret."
In the secret, Sinita bears her tortured soul. She tells about the fact that Trujillo (the President) is a murderer, and among other horrible things he has done, he has murdered Sinita's three uncles, her father, and her brother.
A family friend, in sympathy, pays for Sinita to go to the school. The nuns are aware of Sinita's personal loss, of the deaths of so many dear to her, and they go out of their way to make sure she is provided for. When Sinita and Minerva choose bunks next to each other in the dormitory, Sor Milagros looks into Minerva's face, questioningly. Seeing something good there, and she smiles and asks Minerva to look after "our dear Sinita," which Minerva promises she will do.
It is, then, because of the political assassinations of her family members that the nuns at the school take special care of Sinita.