Elizabeth Tabish is a standout in The Chosen as Mary Magdalene. Her best scenes and moments include interactions with Jesus and Matthew.

An illustration of a magnifying glass. An illustration of a magnifying glass.

But “Mary Cassatt / Berthe Morisot: Allies in Impressionism,” opening May 24 at the Fenimore Art Museum in Cooperstown, reframes that narrative by spotlighting two of the era’s most accomplished—and ...