She came to our neighborhood and was mostly ignored, and occasionally teased.
Correct! Ellen is teased as Boo and Piggy are teased. She is as isolated as they are.
Ellen is in 7th grade.
Boo and Piggy are grown men.
Sometimes I see her hanging out in her front yard afraid to leave it.
Correct! She isolated herself like Boo does and like Piggy does unless he’s picking up garbage.
Ellen suffers at the hands of insensitive children.
Correct! All three characters are teased by children.
Adults have sympathy for all three characters.
Correct! Atticus, Grandmother, and the grown-up George Saunders all understand and have sympathy for the outcasts.