Final answer:
The claim about Chiara Margarita Cozzolani is false, as the provided information does not reference her taking final vows at age eighteen or her family's wealth.
Step-by-step explanation:
The statement about Chiara Margarita Cozzolani entering a convent and professing her final vows at age eighteen as coming from a family of a wealthy Milanese merchant is false. The provided information does not reference Chiara Margarita Cozzolani, nor does it confirm the specifics of her taking final vows at that particular age. Instead, the reference materials elaborate on different historical religous figures and events such as Catherine de Vigri, Jeanne Córdova, and periods of pestilence in Milan but not specifically about Cozzolani's background or her final vows. To accurately confirm details regarding Chiara Margarita Cozzolani, additional information would be needed.