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Are you referring to Malcy-Louise-Caroline-Frédérique Berthier de Wagram, 1832-1884?

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If so this genealogy page online

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https://gw.geneanet.org/orlov?lang=en&n=berthier+de+wagram&oc=0&p=malcy+louise+caroline+frederique

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says that her maternal grandmother was Anne Jeanne Rouyer and her paternal grandmother was Maria Elisabeth Franziska de Wittelsbach-Baviere.

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So if she was named after a grandmother than implies to me that Malcy was a pet form of "Maria Elisabeth".