Edit: I've since moved. Bon voyage, my obnoxious friend. The noise she makes is sometimes so deafening, I am convinced she's doing one or more of the following:

• Irish dancing/clogging.
• Bowling.
• Moving heavy furniture. Multiple times a day.
• Step aerobics.
• Entertaining heavy, hooved animals.
• Keeping time to music by banging a staff on the floor.
• Sleep-stomping.
• Testing out her earthquake machine.
• Having narcoleptic fits.
• Participating in a jackhammering competition inspired by Rocko's Modern Life.
• Building an ark.
• Carving ice sculptures with a chainsaw.
• Chiseling herself an intricate marble fireplace.
• Practicing various lumber-jacking activities.