What miracles did Saint Isabel of France do?
Isabel has been beatified but not canonized as a saint yet. She was the sister of King St. Louis IX of France and is not noted for any miracles.
What we know of the miracles of St. Benedict of Nursia was written in Dialogues by Pope St. Gregory I, who was not really a contemporary of Benedict. Euan Cameron (Interpreting Christian History) says that Pope Gregory displayed a credulous reception of miracle stories so naive that some analysts have doubted whether he really wrote the book. Gregory says that Benedict repaired, by the power of prayer alone, a sieve which his nurse had allowed…
In the ancient Church miracles were not required to prove a particular person was in Heaven. They were simply declared a saint by a bishop at the urging of the local Christian community. Today only the pope can declare a saint and only after years of investigation including at least 2 proven miracles.