Her grave was opened and relics were retrieved from which multiple miracles were attributed, most involving unexplained cures through the ingestion of water that had contacted with the relic. In her process of canonization,  has became famous  the persistence of his son Gonçalo Correia de Sousa, of whom D. Francisco Manuel de Melo, in the chapter dedicated to “Dangerous Removals and impertinences of his Letter of Guide of Married men”, says that he acted with exquesita annoyance together of the cardinal whom Pope Paul V had in charge of the case of the venerable Margarida de Chaves. After much pressure, and unable to avoid a further meeting with the petitioner, the cardinal exclaimed in exasperation: "Lord, let us not become weary in proof of the sanctity of your mother; only prove that she suffered  you, that the pope will declare she as a saint.”.

Margarida de Chaves had Gaspar Frutuoso as her confessor, who gave her Chapter XV of Book IV of Saudades da Terra, but her most complete biography is the work entitled A Margarita Animada, by Francisco Afonso de Chaves e Melo.

The Chapel of St. Margarida Martyr was instituted on September 25, 1645 and consecrated on September 8, 1658. The invocation of St. Margarida Martyr was provisional until the oblation of the beatification was obtained, from which time the Chapel became invocation to Santa Margarida de Chaves (which would only happen 100 years after the death of Margarida de Chaves).