Little Women was originally published as two books: Little Women and Good Wives. In some places it is still published this way, but in most modern US copies of the book they combine the two, usually labelling them parts one and two. Little Women, the first book ends just after John Brooke proposes to Meg. Good Wives picks up a few years later presumably when he has earned himself enough to support Meg as promised.
"She did not think herself a genius by any means; but when the writing fit came on, she gave herself up to it with entire abandon, and led a blissful life, unconscious of want, care, or bad weather, while she sat safe and happy in an imaginary world, full of friends almost as real and dear to her as any in the flesh."
Little Women, Louisa May Alcott