“It's home—all the home there is—anywhere!”
Billy’s outburst shows how strongly a place and the people within it can become home precisely when circumstances make her think she must leave them.
Source details
Miss Billy, Chapter XVI, ‘Kate Takes a Hand,’ Project Gutenberg #3266. The line ‘It's home—all the home there is—anywhere!’ occurs at the end of the chapter after Billy decides to leave the Henshaw household because she fears disrupting it; Chapter XVII begins immediately afterward. It is Billy Neilson's distressed fictional speech about a specific domestic conflict, not a general rule about family, belonging or housing.