Robson had her sternest test of this tournament, needing over three hours to oust the world number 47, with constant exchanges of break seeing the pair trade two close sets before the 18-year-old dominated the third.
"I am pretty tired right now but I’ve had a massage and an ice bath so I’ll be fine for tomorrow," Robson told website www.thetennisspace.com in an interview just after her gruelling match.
"I think after New York I’m feeling pretty confident on court and I’m not really having any trouble serving out matches at the moment, which is always good.
"But I’ve still got a lot that I can improve on, so I’m trying not to focus on anyone else’s expectations, just focusing on improving and listening to my coach."
Robson has had a fantastic couple of months since reaching the last four in Palermo after Wimbledon, winning an Olympic doubles silver with Andy Murray in London before knocking out Kim Clijsters and Chinese number one Li Na at the US Open.
The British number one has now beaten China's top three players in the space of one month.
The London-based teenager, who is at a career-high ranking of 74 after reaching the fourth round at Flushing Meadows, is set to improve on that now she has reached her second career semi, where she will play world number 30 and highest remaining seed Sorana Cirstea.
The Romanian beat France's Alize Cornet 6-4 6-3. Top seed Marion Bartoli withdrew in the first round after suffering a stomach illness, while second seed Zheng Jie lost to Robson in the previous round.
The other semi-final sees Poland's Urszula Radwanska face Taiwan's Su-Wei Hsieh.
Poland's Radwanska beat South African Chanelle Scheepers 6-1 7-5, while Hsieh easily saw off Frenchwoman Mathilde Johansson 6-3 6-0.