In the Merchant Ivory picture, Le Divorce, there is a painting supposedly painted by the French painter, Georges de La Tour, which plays a role in the plot. Was it a genuine painting by this painter?
Georges de La Tour (1593 - 1652) had many beautiful paintings, but this was not one of them. It was invented simply to add authenticity to the story.
If you're interested though, and on a completely different note to your question, Georges de La Tour drew a lot of inspiration from the great Italian artist Caravaggio (1571 - 1610), who did have a painting of Saint Ursula, titled "The Martydom of Saint Ursula".
As to your original question though, the answer is a resounding no unfortunately.
The St. Ursula painting in the movie Le Divorce was painted by the French painter Jean-Paul Letellier specifically for the movie. No idea on what happened to it.