Who is Betty Davies Randolph from A Cure for Dreams: A Novel and what is their importance?

Betty is very much Lottie's daughter. After a lifetime of being Lottie's main confidant and cohort, it stands to reason that Betty would share similar opinions to Lottie. However, the similarity goes further. Betty's desire leave and experience life beyond Milk Farm Road, though a source of stress for Lottie, is a direct result of inheriting Lottie's inquisitive nature.