Beth is Marmee's most willing pupil and is also often doing little acts of kindness for her sisters and the neighbors through the works of her never-idle hands. She is the blessing that no one realizes they have until they miss it. Beth is not without her faults, but her sweet and willing nature make them easy to forgive for her sisters. She is everyone's confidant, though shy in public and only leaving her home very occasionally.
Beth is a model of patience and humility. It is she who helps Marmee make sure the house runs smoothly, even doing her sisters' duties when they slack or forget.
Beth's kindness gets her into trouble however when she brings scarlet fever home and is laid low for a time, never to fully recover. Beth learns to carry this new trouble calmly and patiently, speaking of it to no one but keeping on without troubling her family.
Still her same humble self, she tells Jo, "I'm not like the rest of you...I couldn't seem to imagine myself anything but stupid little Beth, trotting about at home, of no use anywhere but there." But "stupid little Beth" is so much more to everyone around her. Eventually the inevitable day comes and all her family feels sorely the loss of their dear Beth.