Spider-sense was going crazy, but Jessica had experience with fire-themed bruisers. And this lady was no Norman Osborn.

... She was clearly way more powerful than Norman Osborn.

"I mean, the Skull's the guy with the plan, right? You're just the lovely assistant in his magic show," Jessica suggested. "And your work is valued, but... c'mon." Jessica was crouched and ready to spring away the second the taunting caused fireballs or magic blasts or both.