The Philadelphia Democrat, 52, was ordered Friday to serve 23 months on probation for accepting cash-stuffed envelopes from an undercover operative in a sting investigation. As of Monday, she had not submitted a letter of resignation from her $88,600 job, according to House officials. And it is unlikely that she will do so before Jan. 1, when lawmakers are to be sworn in for the new two-year session, according to people familiar with her plans.