In the latter half of part one of Wide Sargasso Sea, Antoinette begins to attend the Mount Calvary Convent school in Spanish Town, Jamaica a year after her mother passes (we find this out because she reflects on the funeral). While attending this school, a lot happens in Antoinette's life including age and values. Within her first day, she is bullied by children at the school who claim that she is crazy, much like her mother Annette and threaten to hurt her. On the same day, Antoinette meets her father's illegitimate son Sandi who protects her against the bullies. Throughout the negatives in the time that Antoinette is at this convent, she also meets Louise de Plana whom she becomes fascinated by because of her beauty and grace. While at the convent, Antoinette learns about womanhood, religious values, cross-stitching, and more. This is part of the turning point in the novel because, during her time here, Antoinette becomes older than she was at the beginning and will soon be married to Mr. Rochester (though she doesn’t know it yet).
Here is an interesting article about the author: https://www.theparisreview.org/blog/2016/09/02/jean-rhys-wide-sargasso-sea/
Rhys, Jean. Wide Sargasso Sea, W. W Norton & Company, 1966.

KJ