Look for something in the house on a timer that gives her a clue it is 3 AM. If you recently had a power outage, something like a light on a timer may have been reset. Or it could be an early rising neighbor. Failing to find something like that, see the vet.
None of our 22 puppies had problems like that when crated.
None of our 22 puppies had problems like that when crated.