I have said this elsewhere and often. Connie's arc as a character in all threee movies is astonishing. Starting off as the "spoiled guinea brat" in GF, she evolves first into the slutty divorcee, and then Michael's caretaker in GFII, and by GF III she is a real force in the family. She gives the order to have Zasa killed, she shepards the rise of Vincent to become Michael's successor, she becomes Michael's closest confidante, and even soothes his guilt about killing Fredo. Then she makes her bones by offing
Altobello with those cannoli. She was a late bloomer, but by the end of GF III she was most definitely her father's daughter.