Petra lost 6-2, 2-6, 6-2. She has not beaten a Top 100 player since her win against Caro.
This is way below her regular potential. But maybe her ranking now is telling the truth.
In a few weeks, she's got ITF points to defend, so let's hope she keeps continuing to play for the rest of the year and improving that form.
She is way better than this and we all know it.