A previous victim of the man accused of killing a Queens mom sex worker in a SoHo hotel believes that if authorities in Florida had heeded her warnings, the slain woman would be alive today. Leah Palian, 26, first met Raad Almansoori last year when the two were working at an Orlando, Fla. restaurant, she told the Daily News. Months after she says he attacked her, on the day of the SoHo hotel slaying he called her, breaking an order of protection, to ask why she had treated him so badly, she says. He would eventually commit a horrifying sexual assault against her and come close to taking her li…