Yeah. I know what you mean to.
However, it's not just her game style (risky shot making) on how/why she could get hot. A lot of players can play with risk, but not have her abilities.
As you know, Petra's got that easy smooth power. Petra can also have her great serving, returning, angled shots and precision. Her volleying, slices, various spins, and spectacular shot making are just added bonuses, if/when she's really feeling it.
We've all seen these things from Petra (from varying to absolutely complete degrees) before. The question, when are we gonna see it/them again?