She would always tell on Jem and Scout. But later for Jem to find out, Mrs. Dubose was only like this because she was sick. Later when Mrs. Dubose died, Jem learned more about her. She was very courageous and hard working.
In fact, ravens will eat just about anything, including the occasional pickings from garbage cans for the city-dwelling ravens. Their usual diet contains insects, seeds, carrion (meat from the carcasses of animals killed by predators), the eggs and nestlings of other birds, and frogs.
It should be noted, that contrary to some local folklore, most hawks and owls eat mostly snakes, mice, and rats, and therefore you should consider them most beneficial to have around. A couple hawks are grasshopper specialists, so also very beneficial. Owls are better rat and mouse catchers than man or cat could ever be.