Was this an ouroboros sort of story? Was the Banisher also the little girl she saved? I got that distinct impression since most of the characters were missing names.
I think it's an ecosystem rather than an ouroboros. My take is that the Banisher was one of the ugly children that people in this town bury alive in the cellars. The screams of the dying children summoned all the dark things that infest the houses. The Banisher was saved by a Nevermore, which brought her food beneath the floor, until eventually she escaped. 25 later, she comes back to that same house to banish something for the new owners, finds the Nevermore, and recognizes it as the one that saved her. Then she decides to track down her parents just in time for their 25th wedding anniversary
...and, well, y'know how that turned out.