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A ringmaster should be charismatic, so I'd recommend an Overwhelming Soul (yes, yes, everybody hates the archetype; I don't). Definitely give her flight, either through Greater Flame Jet or by taking Air as a secondary, and Eruption for AoE damage. Otherwise, just have fun, it's the whole point of the class. :)
For utility I'd suggest foxfire and smoke storm, in addition to the flame jet + greater that Catharsis is suggesting. Fire's fury is about standard for pyros, but a circus type might get fire sculptor instead.
As far as infusions go burning infusion and draining infusion are normal for pyros who want to be able to damage resistant enemies. Kinetic blade and extended range also work around kineticist weaknesses. An area effect or kinetic whip might round those out.