There we go thinking about this logically again. Is that going to get anyone anywhere?

"Oh! Heating up, isn't it? No, the only thing that's changed is you managing to transform, right? So that must matter. Showed you to do it, or something."

"My turn."
Honeysuckle places an outstretched hand just over another, still-cool thermometer and tries to imagine the flame appearing, the same way she imagined the fox moving.

If one watched closely, they would notice:
A candle-flame appears at her fingertip, and the recorded temperature starts to rise.
Just an instant later, there is a separate, larger blast of fire that throws Honeysuckle's hand back, spins her around a bit, and may well crack open that thermometer.