Was Tiepolo's wife affected by Graves' disease?

Tiepolo (1696-1770) was an Italian Rococo painter and printmaker, and is now considered to be one of the most important members of the 18th-century Venetian school. The muse that lent her face to Cleopatra and inspired many Tiepolo's works was his beloved wife, Maria Cecilia Guardi. Because of her appearance, we cannot rule out that she suffered from Graves' disease, an autoimmune condition that is characterized by goiter, exophthalmos and restlessness.