In the early part of the match Cornet went to her knees in the serve follow thru. I thought she lost her balance, but it was due to very weak legs.
After chasing down a drop shot she went to her knees again and had trouble getting up.
After a long rally, Cornet went to her knees again for 3 or 4 minutes and was crying. The chair came over to her and she finally got up and continued.
Cornet then had a long MTO and toilet break, but never a very much energy.
I thought she should have quit in the 1st set, but Cornet was playing the #181 ranked Tomova who she probably thought she could beat with only one leg working.