Basically, in this tale a farmer's girl lost her way in the forest and stumbled across a hut inhabited by seven dwarves. She asked them for a place to stay for the night, and received it (after the dwarves argued about who would get the honor of giving up his bed for the girl).
A short term later, a farmer woman arrived. When the girl opened the door and explained that there was no more space, the farmer woman suspected her of being the lover of all seven dwarves, called her a slut ("Lumpenmaitschi" in the local dialect), and then fetched two men who killed the dwarves in the same night, buried the corpses in the dwarves' garden, and burned down the hut (the girl, however, had managed to escape).
This tale is from an obscure 19th century folk tale collection from the Aargau Canton in Switzerland, and I don't think it has ever been translated into English. But I think I shall do so at the earliest opportunity.