Vlašić remained in gold medal position by continuing her perfect round to 2.03m.
After Vlašić missed for the first time in the competition Hellebaut's fortunes reversed with a first attempt clearance of 2.05 m (6 ft 8+1⁄2 in), leapfrogging her into the lead.
Vlašić cleared on her second attempt, while Chicherova ended her competition with three straight misses.
The fourth- and fifth-place finishers, Yelena Slesarenko and Vita Palamar also tested positive in the 2016 re-tests.
NM - No Mark NR = National Record / PB = Personal Best / SB = Season Best