Her parents were Johann Heinrich Keverich and Anna Klara (Clara) née Westorff, who were married in 1731.

From 1733, Johann was head cook at the court of Franz Georg von Schönborn, the Elector of Trier, at Schloss Philippsburg in Ehrenbreitstein.

[3][4] Among her siblings was Johann Peter Keverich, who later became a priest and Prior of the Carmelite Monastery in Koblenz.

She married Johann van Beethoven at the Church of St Remigius, Bonn on 12 November 1767.

Johann and Maria van Beethoven had seven children: the future composer Ludwig was the second, born in 1770.