Who is Claribel from The Sun, the Moon, the Stars and what is their importance?

Claribel is Magda's loyal and true friend. She provides Magdalena with support during her break-up with Yunior. Yunior describes Claribel, a native of Ecuador, as "chinita," a woman having almond-shaped eyes like an Asian. She is college-educated, graduating with a biology degree. Because Magda still lives at home, Claribel covers for her whenever she stays over at Yunior's apartment. She is the only one of Magda's friends who is mentioned by name.