A rising San Francisco political figure has been sidelined by a sudden health crisis, and insiders say her future in office is now hanging by a thread. Jackie Fielder, one of the city’s most outspoken progressive supervisors, has been hospitalized after disappearing from public view for roughly two weeks, according to a report. Her office confirmed she’s dealing with what it described as an “acute personal health crisis,” but offered no further details about her condition. Sources told The San Francisco Standard there has been significant internal upheaval within Fielder’s office in recent weeks, and that she has privately indicated...