Seasoned Chitra, who had two world billiards titles and Australian Open crown to her credit, defeated 17-year-old Varsha 4-0.
With her last four-place secured, Chitra now is assured of at least a bronze medal from the event.
Chitra will play unbeaten Wendy Jans of Belgium in the semi-final later today.
Varsha had outperformed Arantxa Sanchis 4-1 while Chitra got the better of Vidya Pillai 2-4 yesterday.
Meanwhile in the men's competition, Manan Chandra and Shahbaaz Adil Khan lost to England's Jeff Cundy and Zhao Xintong of China in their respective pre-quarterfinal matches to end India's march yesterday.
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Chandra was never allowed a chance to look in or settle down by Cundy. In the fourth frame, Chandra had a break to seize the lead but Cundy came up with a 74 break to win the frame while Shahbaaz was way below-par and when opportunities arose he failed to grab them.
Results:
Women's - Chitra Magimairajan beat Varshaa Sanjeev 59-47, 71-42, 61-26, 61-27.
Men's: Manan Chandra lost to Jeff Cundy 5-0 (54-75, 0-120(103), 25-65, 69-74(74), 20-77)
Shah Baaz Adil Khan lost to Zhao Xintong China 5-1 (46-83, 18-72, 40-67, 31-61, 85-54, 55-68).