Final answer:
The excerpts provided do not directly answer where Agatha landed after descending from the beanstalk; there seems to be confusion with classic fairy tale characters as none of the referenced texts include a character named Agatha or describe her climbing down a beanstalk.
Step-by-step explanation:
The question asks where Agatha landed after climbing down the beanstalk. However, based on the references provided, it seems there may be a mix-up with fairy tale characters or a metaphorical usage since none of the excerpts directly mention a character named Agatha or a beanstalk. Instead, characters like Sylvia from 'A White Heron' by Sarah Orne Jewett, make a perilous descent, and also in other excerpts, characters are seen making various descents or land in different scenarios such as Bess and Venters in Zane Grey's 'Riders of the Purple Sage', witnessing the industry of beavers. But none of the details accurately describe Agatha's descent from a beanstalk, which typically would refer to the character Jack from the classic fairy tale 'Jack and the Beanstalk'.