Beatrice Ann Kemp (neé Haswell) or "Aunt Bea" is a passionate, feisty woman who is (most notably) the aunt of Ramona Quimby. She is the sister of Dorothy Quimby, who named her daughter after her. She is played by Ginnifer Goodwin in the movie.
In the books, being younger, Beatrice was described as the less sensible of the two sisters, and grew up quite hasty. She always spent her money on junk instead of saving it and envied Dorothy's splurged items. Dorothy would not talk to Beatrice since the revenge of her sister vandalising her new autograph album but eventually they made up when their mother gave them both new autograph albums for Christmas.