First thought - buy Energy Control, with all the different energy types as extras.The rest of her powers come from the eagle-topped sceptre she uses. This allows her to manipulate and detect the manipulation of any form of energy. Though she cannot use more than 20 dice in five rounds, they can be used in any energy form (as can all her powers indicated by an asterisk). Similarly she can manipulate energy fields which allow her to do up to 2d6 damage in minor ways — by adjusting temperature or electrical flow-or perform minor effects-detecting and tracking radio waves, bending the light around her shield to render it invisible and the like. She has, as a result, a number of unique options which the supervisor should use with imagination.
Second thought - put together a custom power by assembling all the different abilities I'd want her to have, with the different energy forms being purely background trappings
Third thought - Buy a single Energy Blast of one energy type, with attacks of other energy types as Power Stunts. This wouldn't work for the base Energy Control power, as I can see cases where she'd want to manipulate two different energy types at once.
Because she's an NPC and her exact abilities under the Golden Heroes rules are left pretty vague, I can get away with winging it however I want, but I'd be interested to see how anyone else would model a power based on the above description.