By SHERRIE ANN TORRES SHE USUALLY works from 10 a.m. to 7 p.m., Monday to Friday. But these days, Rosario “Bea” Obsequio Riel, director of the Internal Audit Department (IAD) of the House of Reprentatives, stays awake, working even at home, until three in the morning. Riel is compiling evidence for a case she is