I don't have the information you are looking for, but here is what I have (mostly regurgitated I'm afraid):
Her name is actually documented in our family book as 'Maria Catharina Popping'. Married May 5, 1835 (in another section it says April 5 instead of May 5); Born 1809 in Prussia; Died December 18, 1851 in Prussia. Married at St. Lamberts in Coesfeld. Buried in St. Lamberts in Coesfeld. Children: Heinrich, Elizabeth, Anton, Franz (who was my great-great grandfather), and Maria Catharina.
Ludwig married again after Maria's death, and this second wife died very soon. He and the children then immigrated to Illinois.