A Queens woman does her damage from a third-floor apartment with an ocean view: Water left running for days, flooding the building. Smoke pouring from beneath her front door. Hoarding old junk in the hallway, from bicycles to shopping carts. Taking a sledgehammer to her kitchen cabinets. But her exasperated Rockaway landlord and unnerved neighbors can’t get help from anywhere. Not from the cops. Not from the fire department. And not from a housing court crippled by the pandemic. “I’m trying to evict her because she’s a nuisance and the courts are supposedly open for business,” said building ow…