Her stories are about children in moderately difficult circumstances - with friends who bully them, or parents who quarrel or don't have enough money. Standard fare, perhaps, but the difference from so much traditional children's fiction is that these children live, as the author herself once did, in council flats and go to state schools.She's much more well-known in the UK than she is on this side of the pond, but her books are starting to get more limelight over here.
I was lucky enough to have Wilson herself come talk to a Children's Literature class I was taking while studying abroad. Unfortunately, this was before I had any idea who she was, and I principally remember the number of rings she had on. Dang.