“Miss Maudie hated her house: time spent indoors was time wasted.”

Could be perceived as a metaphor. She wants to be amongst other living things, feeling the beauty of, what she believes to be, God’s earth. This could have been amplified by her husband’s death.

In another sense, she wants to bring the community together, meaning she was fond of everyone in Maycomb, the Radleys and all. This sets up for later in the story, when perhaps the Radleys emerge from their decrepit home.