|That bright horizontal thing above the altar is the relic of Frances|
She accepted the wisdom of the day, which said that a wife is bound to leave her devotions at the altar and to find God in her household work. She had three kids and was a dutiful wife to Lorenzo (who apparently did not object to her piety). Two of her children died of the plague and the third, Battista, was appointed to be a hostage in Naples. Francesca took her son to the appointed handover site, but stopped at a chapel along the way to entrust his life to the Blessed Virgin Mary. When Battista was surrendered to the Neapolitans and mounted up to travel with them, his horse refused to move. They beat the poor beast mercilessly, but it would not take a step. Recognizing an act of God when they saw one, they handed Battista back to his mom and continued on their way.
And the thing about drivers? Apparently when she went out at night, her angel would guide her steps with something very much like a headlamp. Meh, there are worse patronage assignments, and since Saint Christopher was pulled from the canon in 1969, Roman Catholics may want to think about finding a Dashboard Frances.