Semhar Tadesse

She braved the wilderness ... but former "Survivor" contestant Semhar Tadesse was no match for the tacky carpet in her L.A. apartment ... snagging her heel and breaking her foot ... and now she's suing her landlord. Making matters worse, sources tell TMZ the fall took place on the staircase back…

"Survivor" cast-off Semhar Tadesse just admitted in open court ... she was three sheets to the wind when police arrested her for DUI last October -- and now, she's ready to face the music. TMZ broke the story ... cops pulled over 25-year-old Semhar after she ran a red light -- then arrested her on…