Who lives in the lone shack by Blackbird pond?

From the text:

"I was wondering about that little house," said Kit, by way of excuse. "I thought you said no one lived down here." Far over to the right, at the edge of a marshy pond, a wisp of smoke curled gently from a lopsided chimney. Beyond the little shack something moved. Was it a shadow, or a slight stooped figure?

"Oh--that's the Widow Tupper." Judith's voice was edged with contempt. "Nobody but Hannah Tupper would live there by Blackbird Pond, right at the edge of the swamp, but she likes it. They can't persuade her to leave."