The Russian will return to the top 50 next week with the Australian Open looming at the end of the month, but she failed to reach her second final since returning last April after a drugs ban.
Siniakova, the sixth seed, beat the 30-year-old 6-2, 3-6, 6-3 and will face world number one Simona Halep in the final.
Halep cruised into the decider in southern China with a comfortable 6-1, 6-4 victory over fellow Romanian Irina- Camelia Begu.
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