She continued but only won one more game in a 4-6, 6-0, 6-1 defeat.
"They definitely should have just not started the matches in the first place," she said. "And the same goes for a couple of days ago when I played my (first) match."
The heat wave began Tuesday when the temperature peaked at 42C (108F). The tournament referee did not halt play then because the Extreme Heat Policy also takes into account other factors, such as humidity and wind speed.
The distinction is lost on the players, who have grumbled all week about the conditions which some have described as inhumane and dangerous. On Tuesday, Canadian Frank Dancevic blacked out and hallucinated during his match, while China's Peng Shuai vomited and suffered cramps.
No. 25-seeded Alize Cornet of France sobbed on court Thursday after her draining 6-3, 4-6, 6-4 victory over Italian Camila Giorgi, then blasted officials for not halting play sooner.
"On Tuesday, I don't know why they didn't stop matches," she said. "It was an oven. An oven. It was burning. Why today and not Tuesday?"
The heat hasn't just affected players -- it's also kept fans away. Total attendance was just 49,860 on Wednesday, down from Monday's high of 63,595.
The unshaded seats on the outer courts were virtually empty Thursday, with spectators congregating under trees or in the upper reaches of stands where temporary covers provided a little relief.
New Zealander Helen Naylor escaped the sun after watching fellow Kiwi Marina Erakovic play for a bit on Court 13.
"Even the seats are really hot -- God knows how (the players) are running around out there."
Relief is as least in sight. Friday will be another scorcher, with an expected high of 44C (111F), but Saturday it will only reach 23C (73F). That may feel downright chilly by comparison.
