Xing had clocked 4 minutes and 3.98 seconds to beat Shanxi's Liu Qing on a narrow edge of 0.02 seconds before coaches and officials of the Shanxi athletics team appealed to the arbitration panel for the foul against their middle-distance runner.
In Wednesday's race, XingHuina ran out to lead the first groupmade up of the later top four finishers in as early as the second lap, but was overtaken by Liu Qing only 200 meters to go before the elbowing case happened.
The 21-year-old Xing, who won the Olympic gold of women's 10,000m last year in Athens with a result of 30:24.36, has retained her dominance in Monday's long-distance race by beating national teammate Sun Yingjie with a time of 31 minutes and 0.73 seconds.
Xing ran a rather slow time in the 5,000m preliminary, clocking 15 minutes and 59.37 seconds to finish sixth in her heat.
Xing, who won the 10,000m Monday night and ran the 1,500m preliminary and finals on Tuesday and Wednesday, is participating in three events at the ongoing games and finding little time for rest.
Earlier, Xing vowed to appeal her 1,500m disqualification, maintaining that the eventual winner Liu bumped her first as the two sprinted for the finish line.