Why are Wyldfyre's powers like this?

Elemental Master of Heat(not fire) Wyldfyre's power has SO much wasted potential. She is the Elemental Master of HEAT, not Fire, that title’s already takennnnn ughhhh. She should be able to DO MORE. All she can do right now is shoot fireballs. FOR GOD'S SAKE, THAT'S WHAT KAI DOES! She should be able to manipulate all heat or at least some of it. Make a literal firewall. Turn into a living, perfect AC(because cold is the absence of heat) and heater. Heat things up to the heat of the sun and...