Lastly, she pictured to herself how this same little sister of hers would, in the after-time, be herself a grown woman; and how she would keep, through all her riper years, the simple and loving heart of her childhood: and how she would gather about her other little children, and make their eyes bright and eager with many a strange tale, perhaps even with the dream of Wonderland of long ago: and how she would feel with all their simple sorrows, and find a pleasure in all their simple joys, remembering her own child-life, and the happy summer days.
This passage being at the end of the story is important because it wraps up truly how Alice feels about adults. She believes that adults are boring and have no imagination, but refuses to be like this when she grows up. This even relates to the comments of "feeding your head" because she is dedicated to sharing her adventure in Wonderland with other kids, as well as truly being changed by this experience.