The Czech player found rhythm just in time to win nine consecutive games to finally secure her 90th career main draw victory on clay.
Shaanxi's backcourt duo of Chen Yanyu and Chen Xinlei, who combined for 57 points in their last game, were restrained to nine and three points respectively.
Fueled by Wei's six points in a row, Inner Mongolia widened the gap back to seven points, and they used a 22-13 second quarter to build a 13-point advantage at halftime.
"To be honest I was over the limit today. At the end I gave everything that I had out there, it was an amazing match," the 27-year-old added.
The Red Bulls fired American coach Chris Armas last month and South African Bradley Carnell took over as interim coach.
The 33-year-old will play 17th seed Pablo Carreno Busta the round of eight. The Spaniard dispatched German qualifier Daniel Altmaier 6-2, 7-5, 6-2.
The Paris Saint-Germain forward has 61 goals in 101 appearances for the Selecao, just one behind Ronaldo and 16 shy of record holder Pele.
Also missing will be injured left-back Nilson Loyola and influential winger Edison Flores, whose club DC United refused to release him because of a mandatory 14-day self-quarantine for those returning to the United States capital from abroad. In addition, forward Jefferson Farfan is in doubt for the matches after re-injuring his troublesome left knee.
Slovan's Canadian forward Brendan O'Donnell could have tied the game in the second period but only hit the goal post to go 1-2.
With a 4,000-seat capacity, the Weihai Nanhai Olympic Center will host the doubles events. The newly-opened venue is currently staging the 2020 China National Table Tennis Championships.
The two-time Grand Slam winner committed just seven unforced errors throughout the one-sided encounter and broke her opponents six times.